History&#x27;s Greatest Inventions, Decoded &amp; Simulated.

US 381,968Electrification & Early Modern (1870–1920)

Tesla Progressive Alternating-Current Motor

Progressive magnetic fields from independently timed alternating currents

Granted on May 1, 1888, this specification describes motors with two or more independently connected circuits fed by a suitable alternating-current generator. Tesla uses the changing strengths and directions of those currents to shift the motor's magnetic poles progressively around a ring, then gives several motor-generator arrangements that turn a disk or armature without a motor commutator.

Granted: May 1, 1888

US 200,521Civil War & Industrial Acceleration (1860–1880)

Tinfoil Phonograph

Acoustic Diaphragm, Indenting Stylus, Grooved Lead-Screw Mandrel, and Tinfoil Recording

Edison describes a diaphragm that marks a yielding surface as sound moves it, then a second point and diaphragm that recover motion from those marks. His illustrated form uses a ten-groove-per-inch cylinder and threaded shaft, but the specification also describes plate, strip, thread-trace, and ink-trace alternatives.

Thomas Alva Edison

Granted: February 19, 1878

US 542,846Gilded Age & Grid (1870–1900)

Diesel Controlled-Combustion Heat Motor

Pre-combustion Air Compression, Gradual Fuel Admission, and Cut-off Expansion

US 542,846 claims a process and machines for converting fuel heat into work: mechanically compress air before combustion, then admit fuel gradually while the working gases expand. Diesel describes solid, liquid, and gaseous fuels, single- and double-acting engines, air reservoirs, and a governed cut-off rather than a spark-ignition engine.

Rudolf Diesel

Granted: July 16, 1895

US 608,969Electrification & Early Modern (1870–1920)

Parsons Selectable Marine Turbine Trains

Series, simple-parallel, and compound-parallel steam routing for screw-shaft propulsion

US 608,969 concerns the valve-and-pipe arrangements that let several marine steam turbines drive screw-shafts economically at cruising and full power. Parsons describes selectable series, simple-parallel, and compound-parallel flow paths, turbine sets of different capacities, and reversing turbines that run freely in condenser vacuum while the forward turbines operate.

Charles Algernon Parsons

Granted: August 9, 1898

US 613,809Electrification & Early Modern (1870–1920)

Tesla Remote-Control Vessel Mechanism

Remote electrical disturbances, a sensitive receiver, and stepped local control circuits

Granted on November 8, 1898, this specification describes controlling a moving vessel or vehicle from a distance without an intermediate wire or cable. Tesla sets out several ways to send electrical disturbances through natural media, then details a vessel receiver, sensitive particle device, relay, escapement, contact controller, propulsion motor, steering motor, and a command sequence that selects their local circuits.

Granted: November 8, 1898

US 1,781,541Industrial & Mass Production (1910–1940)

Einstein–Szilárd Absorption Refrigerator

Three-fluid absorption circuit with a heat-lifted return and partial-pressure evaporation

Einstein and Szilard describe a three-fluid absorption refrigerator. In their illustrated cycle, butane evaporates beside ammonia in evaporator 1; water absorbs the ammonia in condenser 6 so butane can condense and return. Heat in generator 29 regenerates the ammonia, while a heated conduit lifts weak solution to elevated container 33.

Albert Einstein, Leo Szilard

Granted: November 11, 1930

US 6,469Early Industrial Navigation (1830–1850)

Lincoln Expansible Buoyant Chambers

Variable Displacement Chambers Operated by Shafts, Ropes, and Pulleys

Lincoln's 1849 specification claims a vessel-side buoyancy apparatus: expansible air chambers, sliding spars fixed to their bottoms, and a main shaft with ropes and pulleys. Turning the shaft lowers and expands the chambers to displace water; reverse rotation contracts them for protection.

Abraham Lincoln

Granted: May 22, 1849

US 400,766Electrification & Early Modern (1870–1920)

Hall-Héroult Aluminium Electrolytic Smelting Process

Molten Cryolite Solvent Bath, Alumina Dissolution, and Continuous Carbon-Anode Electrodeposition

The landmark foundational patent that transformed aluminium from a rare precious metal costlier than silver into the universal structural material of the modern world. Charles Martin Hall discovered that refractory alumina (Al₂O₃, native melting point 2072°C) dissolves readily in molten cryolite (Na₃AlF₆) at ~950°C. Passing a direct electric current through this fused solution electrolytically decomposes the alumina, causing dense liquid aluminium to collect at the cathode bottom while oxygen oxidizes the carbon anodes into CO₂. Hall's continuous solvent process reduced the price of aluminium by 99%, created ALCOA, and laid the metallurgical foundation for 20th-century aviation, high-voltage electrical grids, and modern architecture.

Charles M. Hall

Granted: April 2, 1889

GB 913Early Industrial Pioneers (Pre-1800)

Watt Separate Condenser Steam Engine

External Condensation Vessel, Concentric Steam Jacket, and Air Pump Vacuum Extraction

The foundational master patent of the Industrial Revolution. While repairing a Newcomen atmospheric engine at the University of Glasgow, James Watt discovered that in-cylinder water injection chilled the iron cylinder on every stroke, wasting over 75% of boiler steam simply reheating the walls. Watt resolved this fundamental thermal conflict by condensing steam in an entirely separate cold vessel while surrounding the power cylinder with an insulating steam jacket, quadrupling thermal efficiency and transforming steam power into the universal prime mover of civilization.

Granted: January 5, 1769

GB 931Pre-Industrial & Early Industrial (Pre-1800)

Arkwright Water Frame Spinning Machine

Differential Roller Attenuation, High-Speed Flyer Twisting, and Water-Powered Continuous Bobbin Winding

British Patent No. 931, granted to Richard Arkwright in 1769, is the foundational milestone of mechanical textile manufacturing and the catalyst of the modern factory system. By passing loose cotton roving through successive pairs of rollers rotating with differential, accelerating velocities, the Water Frame mechanically drafted and parallelized cotton fibers before imparting intense helical twist with 3,500+ RPM flyers. Unlike Hargreaves' Spinning Jenny, which produced fragile weft thread suitable only for cross-filling, Arkwright's machine produced 'Water Twist'—a dense, hard-spun cotton warp yarn strong enough to replace expensive linen in commercial looms, enabling the production of 100% pure cotton cloth at industrial scale.

Richard Arkwright

Granted: July 15, 1769

GB 1306Pre-Industrial & Early Industrial (Pre-1800)

Watt Rotary Motion & Sun and Planet Gearing

Converting Reciprocating Steam Piston Motion into Continuous Rotary Shaft Power with 2:1 Epicyclic Velocity Acceleration

James Watt's landmark 1781 patent solved the greatest engineering challenge of the early Industrial Revolution: converting the reciprocating push-pull stroke of a steam engine into continuous, smooth rotational power without violating James Pickard's restrictive 1780 crank patent. Devised by Watt and his brilliant foreman William Murdoch, the Sun and Planet epicyclic gearing bolted an orbiting 'planet' spur gear rigidly to the engine connecting rod, forcing a central 'sun' gear on the flywheel shaft to make two full revolutions for every single double-stroke of the engine beam. This 2:1 speed multiplication enabled slow, gentle piston motions to spin factory line shafts, textile water frames, flour mills, and iron forges at double velocity.

Granted: October 25, 1781

GB 1420Pre-Industrial & Early Industrial (Pre-1800)

Henry Cort Dry-Puddling Process

Coal-Fired Reverberatory Refining Followed by Hot Shingling and Grooved Rolling

The 1784 English patent sealed to Henry Cort and enrolled on June 12 describes treating pig, cast, scrap, and waste iron in a coal-fired reverberatory or air furnace. The operator works the molten charge with shaped iron bars until it loses fusibility and is brought into nature, gathers the resulting loops, and brings them to welding heat for shingling under a hammer or for passage through grooved rollers. The surviving 1854 Patent Office abridgment records no separately numbered claims and explicitly says the printed specification has no drawings; the local PDF and earlier four-claim edition are therefore withheld research evidence.

Henry Cort

Granted: February 13, 1784

US 1 (X1)Early Republic & Industrial Dawn (1790–1835)

Hopkins Potash & Pearl Ash Calcining Process

Thermal Ash Calcination, Aqueous Lixiviation, and High-Purity Pearl Ash Crystallization

The historic very first patent granted by the United States of America under the Patent Act of 1790, signed by President George Washington, Secretary of State Thomas Jefferson, and Attorney General Edmund Randolph. Samuel Hopkins discovered that roasting raw wood ashes in a furnace prior to leaching oxidizes combustible organics and tar, boosting potassium carbonate yield by over 50% while producing sparkling, high-purity pearl ash for glass, soap, and gunpowder.

Samuel Hopkins

Granted: July 31, 1790

GB 913Early Industrial Pioneers (Pre-1800)

Complete Patent Museum Collection

79 Curated Historic Masterpieces

Displaying 79 historical patents

Watt Separate Condenser Steam Engine

External Condensation Vessel, Concentric Steam Jacket, and Air Pump Vacuum Extraction

Granted: January 5, 1769

GB 931Pre-Industrial & Early Industrial (Pre-1800)

Arkwright Water Frame Spinning Machine

Differential Roller Attenuation, High-Speed Flyer Twisting, and Water-Powered Continuous Bobbin Winding

Richard Arkwright

Granted: July 15, 1769

GB 1306Pre-Industrial & Early Industrial (Pre-1800)

Watt Rotary Motion & Sun and Planet Gearing

Converting Reciprocating Steam Piston Motion into Continuous Rotary Shaft Power with 2:1 Epicyclic Velocity Acceleration

Granted: October 25, 1781

GB 1420Pre-Industrial & Early Industrial (Pre-1800)

Henry Cort Dry-Puddling Process

Coal-Fired Reverberatory Refining Followed by Hot Shingling and Grooved Rolling

Henry Cort

Granted: February 13, 1784

US 1 (X1)Early Republic & Industrial Dawn (1790–1835)

Hopkins Potash & Pearl Ash Calcining Process

Thermal Ash Calcination, Aqueous Lixiviation, and High-Purity Pearl Ash Crystallization

Samuel Hopkins

Granted: July 31, 1790

US X72Early Republic & Industrial Dawn (1790–1830)

Whitney Cotton Gin Fiber Separation

Toothed Cylinder, Slotted Breastwork Grate, and Counter-Rotating Clearer Brushes

Whitney's 1794 record describes a wooden toothed cylinder that carries cotton through a grooved breastwork while seeds remain behind, then a faster contrary-moving clearer that removes lint from the teeth. The complete source is a signed description and affidavit, not a modern numbered-claim instrument.

Eli Whitney

Granted: March 14, 1794

US X8277Early Industrial America (1831–1860)

McCormick Reaper

Crank-driven cutters, gathering reel, platform, and crop divider

US X8277 describes Cyrus H. McCormick's horse-drawn machine for reaping small grain. Its specification sets out a platform, a ground-wheel gear train and cranks, cutter bars, an adjustable belt-driven reel, a divider, and the draft arrangement; it was patented June 21, 1834.

Cyrus Hall McCormick

Granted: June 21, 1834

US X9430Early Republic & Industrial Dawn (1790–1839)

Revolving Gun

Indexed revolving cylinder, locking key, and percussion-cap protection

US X9430 is Samuel Colt's February 25, 1836 specification for a revolving gun. Its text describes a cylinder carried on an arbor, a ratchet and lifter driven by cocking the hammer, a spring-held locking key, separated percussion-cap tubes, and related long-gun lockwork.

Samuel Colt

Granted: February 25, 1836

US 132Early Republic & Industrial Dawn (1790–1839)

Davenport Contact-Plate Electric Motor

Revolving Galvanic Magnets, Fixed Copper Contact Plates, and Stationary Field Magnets

Davenport's sole claim applies magnetic and electro-magnetic power to move machinery. The specification describes rotating, silk-insulated electromagnets whose conductors make position-dependent contact with fixed copper plates, causing their poles to change as they pass stationary field magnets.

Thomas Davenport

Granted: February 25, 1837

US 588Early Industrial Navigation (1830–1850)

Ericsson Submerged Screw Propeller

Contra-Rotating Spiral Plates and a Removable Submerged Stern Installation

John Ericsson's specification describes two submerged broad hoops carrying short spiral plates. Concentric shafts and unequal gearing drive the hoops in contrary directions; the third claim covers a removable upright-stem installation with a protected gear casing.

John Ericsson

Granted: February 1, 1838

US 1,647Industrial Dawn (1840–1870)

Morse Electro-Magnetic Telegraph

Binary Pulse Signaling, Variable-Duration Code, and Electro-Magnetic Relay Repeaters

US 1,647, granted June 20, 1840, describes Morse's American Electro-Magnetic Telegraph as a linked system: metallic conductors, mechanical type for numerical and letter signs, straight or circular port-rules, a signal lever that interrupts the circuit, a register that marks a moving surface, a numbered vocabulary, and methods for laying the line. The pinned nine-page facsimile is the 1840 specification, including three drawing sheets and nine printed claims.

Samuel F. B. Morse

Granted: June 20, 1840

US 3,237Early Industrial & Machine Age (1790–1869)

Norbert Rillieux Multiple-Effect Vacuum Evaporator

Latent Heat Cascading, Multi-Effect Vacuum Evaporation, Submerged Horizontal Tube Bundles, and Differential Thermometer Process Control

Norbert Rillieux's 1843 patent for the multiple-effect vacuum evaporator is widely recognized as the single most consequential thermodynamic breakthrough in the history of industrial chemical processing. By connecting a series of enclosed boiling vessels under sequentially deeper vacuums, Rillieux harnessed the latent heat of water vapor boiled off from the first vessel to boil subsequent juice at reduced temperatures in subsequent vessels. This revolutionary latent heat cascading multiplied the evaporation accomplished per pound of fuel by up to four times, slashed plantation and refinery energy consumption by over 70%, eliminated caramelization scorching, and established the foundational principles of modern multi-effect distillation, industrial desalination, and chemical engineering mass-heat transfer.

Norbert Rillieux

Granted: August 26, 1843

US 3,633Industrial Dawn (1840–1870)

Goodyear India-Rubber Fabric

A sulphur, white-lead, cotton-batting, and heat-treatment process

In this June 15, 1844 grant, Charles Goodyear claimed a rubber-fabric compound of India-rubber, sulphur, and white lead or related lead salts or oxides; cotton-batting laminates; and heat treatment. The specification gives 25:5:7 parts as its preferred India-rubber, sulphur, and white-lead mixture, permits 212°–350° Fahrenheit heat, and says the best effect approaches 270°.

Charles Goodyear

Granted: June 15, 1844

US 4,750Industrial Dawn (1840–1870)

Howe's Lockstitch Sewing Machine

The Eye-Pointed Needle and Reciprocating Shuttle Mechanism Creating the Two-Thread Lockstitch

The Machine That Clothed the World: In 1846, Elias Howe Jr. patented the two-thread lockstitch sewing machine. By abandoning attempts to mimic manual hand sewing, Howe placed the thread eye at the pointed tip of a curved reciprocating needle. As the needle pierced the cloth and slightly retracted, fabric friction dilated a thread loop beneath the seam; a bullet-shaped shuttle shot through the loop with a second bobbin thread, interlocking the two threads at the center of the fabric. Howe's lockstitch sparked the Sewing Machine Combination of 1856—the first modern patent pool in industrial history.

Elias Howe Jr.

Granted: September 10, 1846

US 6,162Industrial Dawn (1840–1870)

Governor-Controlled Slide-Valve Gear

Differential Rock-Shaft Motion and Governor-Released Expansion Cut-Off

US 6,162 describes a tension-braced beam-engine frame, a rock shaft whose arms give unequal travel to paired slide valves, and a centrifugal governor that releases the steam-valve catches earlier as speed rises. The local facsimile is dated March 10, 1849 and records reissue No. 200 on May 13, 1851.

George Henry Corliss

Granted: March 10, 1849

US 6,469Early Industrial Navigation (1830–1850)

Lincoln Expansible Buoyant Chambers

Variable Displacement Chambers Operated by Shafts, Ropes, and Pulleys

Abraham Lincoln

Granted: May 22, 1849

US 31,128Civil War & Industrial Acceleration (1860–1880)

Otis Hoist Safety Catch and Belt Brake

Hook Racks, Spring Pawls, Belt Shipper, and Counterpoise on a Winding Drum

US 31,128 describes a powered hoisting apparatus, not a simple leaf-spring elevator catch. Otis combines a platform lifted by rope G, hook-form racks C and spring-biased pawls f f that lock on rope failure, a hand-operated belt shipper and brake, a lower-travel stop, and a counterpoise rope Q wound on the opposite side of drum H.

Elisha Graves Otis

Granted: January 15, 1861

US 36,836Civil War & Industrial Acceleration (1860–1880)

Gatling Rotary Multi-Barrel Machine Gun

Cylindrical Helical Cam Track, Gravity Hopper Feed, and Multi-Barrel Thermal Distribution

The 1862 mechanical rapid-fire pioneer: Richard Jordan Gatling's rotary gun combining a cluster of 6 to 10 rifled barrels rotated by a hand crank around a central shaft, each barrel carrying an independent reciprocating bolt governed by a stationary internal cylindrical cam track to continuously feed, chamber, lock, fire, extract, and eject cartridges at sustained rates exceeding 200 rounds per minute.

Richard Jordan Gatling

Granted: November 4, 1862

US 48,475Industrial Revolution & Mechanical Age (1760–1870)

Yale Pin-Tumbler Cylinder Lock & Flat Bitted Key

Shear-Line Pin Alignment, Flat Corrugated Keyway, Rotating Plug, and Modular Threaded Mortise Cylinder

Linus Yale Jr.'s 1865 patent describes a lock combining a cylindrical tumbler-case, a rotating plug, two-piece pin tumblers, a thin bitted key, and a lost-motion wing or lazy-arm. The same specification also claims a spring plate for retaining the bolt and threaded cylinder mounting that can be adapted to either hand of lock and to doors of different thicknesses.

Linus Yale, Jr.

Granted: June 27, 1865

US 78,317Civil War & Industrial Acceleration (1860–1880)

Porous-Earth Explosive Powder

Absorbent silicious earth carrier for nitro-glycerine

US 78,317 describes an explosive powder made by mixing nitro-glycerine with a porous, inexplosive absorbent earth. Nobel gives the material's loading range, preparation, screening, packing, and initiation discussion, then claims the composition of matter made substantially from those ingredients in that manner and for those purposes.

Alfred Nobel

Granted: May 26, 1868

US 79,265Civil War & Industrial Acceleration (1860–1880)

Type-bar, carriage, and ribbon mechanisms

Radial type-bars, self-adjusting platen, two-axis paper carriage, ratchet spacing, and ribbon feed

US 79,265 describes improvements to an earlier type-writing machine: a radially slotted disk and direct key-lever action for type-bars, a self-adjusting platen, a carriage with separate writing-line and line-to-line motions, a key-actuated ratchet spacer, and a driven inking-ribbon feed.

Christopher Latham Sholes, Carlos Glidden, Samuel W. Soule

Granted: June 23, 1868

US 105,338Civil War & Industrial Acceleration (1860–1880)

Hyatt Camphor–Pyroxyline Process

Heat-activated camphor solvent action in pressed pyroxylin pulp

US 105,338 describes making a solid pyroxyline compound by wet-pulping the material, mixing in finely divided camphor and optional pigments, removing most water while retaining enough to prevent burning or explosion, then applying 150° to 300° Fahrenheit heat and pressure. Its three claims separately name pulping, heat-activated camphor-gum in the pulp, and pressure maintained through cooling.

John W. Hyatt, Jr., Isaiah S. Hyatt

Granted: July 12, 1870

US 120,057Civil War & Industrial Acceleration (1860–1880)

Gramme and d’Ivernois Endless-Bobbin Dynamo

Closed Series of Small Coils, Contact Rubbers, and Continuous or Alternate Induction Currents

US 120,057 describes several magneto-electric machines built around a continuous series of small coils on a soft-iron ring, cylinder, disk, or moving chain. Contacts at selected coil junctions collect currents that the inventors describe as continuous or, in a stated alternate-current arrangement, opposite in direction. The grant issued October 17, 1871 after a United States application filed August 17, 1870.

Zénobe Théophile Gramme, Eardley Louis Charles d’Ivernois

Granted: October 17, 1871

US 124,404Civil War & Industrial Acceleration (1860–1880)

Westinghouse Double-Pipe Air Brake and Signal System

Two brake pipes, car receivers, automatic tripping cocks, and pneumatic signals

US 124,404 describes a two-pipe railway air-brake system with a local air receiver on each car, cocks that assign the pipes to reservoir charging and brake operation, a mechanical trip that shifts a cock after a derailment or separated coupling, and gauges and whistles for signals between conductor and engineer.

George Westinghouse Jr.

Granted: March 5, 1872

US 135,245Civil War & Industrial Acceleration (1860–1880)

Carbonic-Acid Wort Cooling

Expelling air from hot wort before external water-spray cooling

Pasteur's one-claim process introduces carbonic-acid gas into boiling-hot wort in a closed vessel to expel contained air, externally cools the vessel with water spray, then adds yeast at 16°–18° Réaumur (20°–22.5 °C). It is not a claim to the later familiar heat-hold process called pasteurization.

Louis Pasteur

Granted: January 28, 1873

US 157,124Civil War & Industrial Acceleration (1860–1880)

Glidden's Twisted Barbed Wire

A transverse spur wire clamped between two twisted fence-wire strands

Joseph F. Glidden's 1874 patent describes a fence wire made from two long strands twisted together after short crosswise spur wires have been placed on one strand. The second strand grips each spur's central bend, preventing it from sliding or rotating; a key through the fence-post can retighten the twist if it loosens.

Joseph F. Glidden

Granted: November 24, 1874

US 174,465Telecommunications Dawn (1870–1880)

Bell Telephone

Acoustic-to-Electric Transduction via Continuous Undulating Electrical Currents

Filed on February 14, 1876 and granted on March 7, US 174,465 describes harmonic telegraphy and the use of undulatory electrical currents. Bell connects a sound-driven membrane and armature to an electromagnetic receiver so that a current varying with the sound can set a distant armature in corresponding motion.

Alexander Graham Bell

Granted: March 7, 1876

US 194,047Civil War & Industrial Acceleration (1860–1880)

Otto's Gradual-Combustion Gas Engine

Staged air-and-fuel charges, progressive flame travel, and governed slide-valve gear

US 194,047 describes a gas engine that first admits air, then introduces an intimate combustible gas-and-air mixture behind it. The mixture is deliberately concentrated near the ignition port and increasingly dispersed toward the piston, so Otto says flame, heat, and pressure develop gradually. The patent also describes the four piston strokes, governor-regulated gas slide, and named valve gear that implement that arrangement.

Nicolaus August Otto

Granted: August 14, 1877

US 200,521Civil War & Industrial Acceleration (1860–1880)

Tinfoil Phonograph

Acoustic Diaphragm, Indenting Stylus, Grooved Lead-Screw Mandrel, and Tinfoil Recording

Thomas Alva Edison

Granted: February 19, 1878

US 223,898Electrification & Early Modern (1870–1920)

Edison's High-Resistance Carbon Lamp

A coiled carbon filament, matched platina lead-throughs, and a nearly perfect vacuum

US 223,898 describes an electric lamp built around a high-resistance carbon filament or strip. Edison places the carbon in a nearly perfect vacuum, brings current through platina wires sealed in glass, and describes several ways to make and connect the carbon. His specification ties that resistance to the practical subdivision of electric light: many lamps can be supplied without enormous main conductors.

Thomas Alva Edison

Granted: January 27, 1880

US 233,692Electrification & Early Modern (1870–1920)

Pelton's Divided-Bucket Water Wheel

A central dividing apex, twin curved bottoms, and flaring discharge sides

US 233,692 describes a rim-driven water wheel whose bucket divides an incoming jet at a central apex. The two portions travel through distinct curved bottoms and up flaring sides, then discharge at the wheel's sides rather than into the next bucket. The single printed claim also requires a sloped bucket front that lets the stream enter without striking that face.

Lester A. Pelton

Granted: October 26, 1880

US 235,199Electrification & Early Modern (1870–1920)

Bell & Tainter Photophone Optical Wireless Communication

Voice-Modulated Radiant Beam, Free-Space Optical Transmission, Parabolic Reflector Collector, and Stacked Cylindrical Selenium Photocell

Alexander Graham Bell's 1880 Photophone patent claims methods and apparatus for signaling by varying radiant energy and applying the resulting beam to sensitive bodies. The specification describes sound-driven shutters and reflectors, direct acoustic receivers, and selenium cells whose resistance changes with the received rays, allowing a telephone circuit to reproduce the imposed variations.

Alexander Graham Bell

Granted: December 7, 1880

US 247,804Electrification & Early Modern (1870–1920)

De Laval's Concentric-Discharge Creamer

A rotating chamber with concentric feed and separated-fluid outlets

US 247,804 describes apparatus for separating a compound fluid by centrifugal action. A rotating chamber receives fluid through a pipe concentric with its vertical axis. Nested, concentric nozzles carry separated streams to two annular receivers. The four claims protect the core inlet-and-outlet combination, a curved outer-fluid pipe, a specified stationary receiver with double central nozzles, and the named radial-feed construction.

Gustaf De Laval

Granted: October 4, 1881

US 307,031Electrification & Early Modern (1870–1920)

Edison Effect Thermionic Diode Indicator

Vacuum Thermionic Emission, Space-Charge Conduction, and Voltage Regulation

The landmark foundational patent disclosing the 'Edison Effect'—the physical phenomenon of thermionic electron emission across a vacuum gap. Edison discovered that an incandescing carbon filament in an evacuated bulb emits a unidirectional electric current across empty space to an independent cold platinum plate when biased positively relative to the filament. Edison harnessed this sensitive vacuum current to construct high-precision station voltmeters and automated dynamo-field regulators, directly creating the physical and technological precursor to the Fleming diode, De Forest triode, and 20th-century electronics.

Thomas A. Edison

Granted: October 21, 1884

US 313,224Gilded Age & Grid (1870–1900)

Matrix-Bar Printing-Form Machine

Finger-keyed temporary matrices and a separate casting mechanism

US 313,224 describes a power-driven, finger-key-controlled machine that forms temporary printing matrices from parallel matrix-bars and then casts printing-bars from them. The specification distinguishes a matrix mechanism from a casting mechanism and says that casting one bar can proceed while the next line is being selected and adjusted.

Ottmar Mergenthaler

Granted: March 3, 1885

US 319,596Gilded Age & Grid (1870–1900)

Maxim's Muzzle-Gas Machine-Gun Mechanism

A forward-moving muzzle sleeve coupled to a sliding breech-block

US 319,596 is a divisional specification for a machine-gun mechanism driven directly by gases issuing at the muzzle. Expanding gases push a tapered sleeve and socket forward along a fixed barrel. Links and rods turn that forward sleeve travel into rearward breech motion; a clock-like volute spring returns the mechanism. The four printed claims require combinations of the sliding muzzle sleeve, breech mechanism, connecting rods and links, and, in claim 4, the crankshaft and return spring.

Hiram S. Maxim

Granted: June 9, 1885

US 347,140Electrification & Early Modern (1870–1920)

Thomson Electric Resistance Butt-Welding

Step-Down Transformer, Low-Voltage Kiloampere Currents, Contact Resistance Joule Heating, and Axial Forging Pressure

Thomson's specification describes electric welding as holding abutting metal pieces under small, adjustable pressure while a large current passes through their joint. It illustrates clamp forms, spring, hand, and weight pressure, transformer and battery supplies, and eight claims covering the process and apparatus.

Elihu Thomson

Granted: August 10, 1886

US 361,931Gilded Age & Grid (1870–1900)

Marine Propulsion Engine

A friction-coupled, reversible screw-propeller installation for a gas or petroleum motor

Granted on April 26, 1887, US 361,931 describes Gottlieb Daimler's installation of a gas or petroleum motor in a boat or vessel. The specification couples an in-line motor shaft to a longitudinally movable propeller shaft, uses friction contact for forward motion and a reversing arrangement for backward motion, and also sets out steering, thrust-bearing starting, water cooling, and gas-reservoir arrangements. It is not a motor-carriage patent.

Gottlieb Daimler

Granted: April 26, 1887

US 381,968Electrification & Early Modern (1870–1920)

Tesla Progressive Alternating-Current Motor

Progressive magnetic fields from independently timed alternating currents

Granted: May 1, 1888

US 388,850Gilded Age & Grid (1870–1900)

Eastman Light-Tight Roll-Film Camera

Removable Film Holder and Spring-Driven Cylindrical Shutter

US 388,850 describes a tubular camera case with a removable rear roller-holder for prepared film and a removable, light-tight front lens-and-shutter module. Its 41 claims cover the paired-aperture cylindrical shutter, its spring-and-ratchet drive and release controls, the sectional front block, and the rear film carrier.

George Eastman

Granted: September 4, 1888

US 395,781Gilded Age & Grid (1870–1900)

Record-Card Statistical Compiler

Index-points, circuit-controlling contacts, counters, and sorting boxes

US 395,781 describes an art and apparatus for compiling statistics from separate record-cards. Circuit-controlling index-points on each card cooperate with contact devices; the resulting circuits actuate electro-magnets for counters, indicators, and sorting boxes. The specification also describes cards prepared for Baltimore mortality statistics as one practical illustration.

Herman Hollerith

Granted: January 8, 1889

US 400,766Electrification & Early Modern (1870–1920)

Hall-Héroult Aluminium Electrolytic Smelting Process

Molten Cryolite Solvent Bath, Alumina Dissolution, and Continuous Carbon-Anode Electrodeposition

Charles M. Hall

Granted: April 2, 1889

US 470,918Gilded Age & Grid (1870–1900)

Reno Endless Conveyer

Hinged passenger belt, combed landings, and a traveling hand-rail

Reno's 1892 grant describes an inclined passenger conveyer made from hinged cast-iron belt sections. Fixed comb-like landings register with the belt's longitudinal grooves, while a linked moving hand-rail travels beside it. The specification gives a preferred 25-degree slope, a speed of about 200 feet per minute, and a stated maximum single-file capacity of 6,000 passengers an hour.

Jesse W. Reno

Granted: March 15, 1892

US 542,846Gilded Age & Grid (1870–1900)

Diesel Controlled-Combustion Heat Motor

Pre-combustion Air Compression, Gradual Fuel Admission, and Cut-off Expansion

Rudolf Diesel

Granted: July 16, 1895

US 586,193Electrification & Early Modern (1870–1920)

Marconi Spark-Oscillation Receiver and Reset Mechanism

High-Frequency Spark Oscillations, Metallic-Powder Detection, and Automatic Decohering

US 586,193 describes a spark-oscillation signalling system with directed reflectors, a metallic-powder circuit-closer, and a trembler that restores the detector after each received impulse. The printed claims concentrate on the receiver's variable-resistance contact, its local circuit, choking coils, automatic reset, and transmitter-receiver combinations using earth and insulated conductors.

Guglielmo Marconi

Granted: July 13, 1897

US 593,138Electrification Era (1880–1900)

Tesla's High-Potential Transformer

A spiral secondary winding that keeps adjacent turns near one another in potential while moving the high-potential terminal away from the primary.

Tesla's 1897 transformer arranges primary and secondary windings so the secondary's greatest potential is remote from the primary and adjacent turns have a small voltage difference. The grant also describes paired step-up and step-down transformers for transmission.

Granted: November 2, 1897

US 608,969Electrification & Early Modern (1870–1920)

Parsons Selectable Marine Turbine Trains

Series, simple-parallel, and compound-parallel steam routing for screw-shaft propulsion

Charles Algernon Parsons

Granted: August 9, 1898

US 613,809Electrification & Early Modern (1870–1920)

Tesla Remote-Control Vessel Mechanism

Remote electrical disturbances, a sensitive receiver, and stepped local control circuits

Granted: November 8, 1898

US 621,195Gilded Age & Grid (1870–1900)

Zeppelin Navigable Balloon Compartments and Trim

Rigid Compartments, Maneuvering Gas Bags, and Running-Weight Control

Granted March 14, 1899, this specification describes a navigable balloon with separately arranged motors, a rigid compartmented framework, main and auxiliary gas bags, propellers, rudders, a movable running weight, and arrangements for coupling balloons into a train. The printed application date is December 29, 1897.

Ferdinand Graf Zeppelin

Granted: March 14, 1899

US 682,690Electrification & Early Modern (1870–1920)

Peter Cooper Hewitt Mercury-Vapor Arc Lamp

Low-Pressure Mercury Vapor Discharge, Cathode-Spot Emission, and Inductive Starting

Peter Cooper Hewitt's landmark 1901 patent for the commercial mercury-vapor discharge lamp. By overcoming the cold cathode resistance barrier using a transient high-voltage inductive starting surge and providing an enlarged condensing chamber for vapor pressure stabilization, Hewitt achieved an extraordinary luminous efficacy exceeding 60–100 lumens per watt—five to ten times higher than contemporary carbon-filament incandescent bulbs. Hewitt's discovery founded modern fluorescent lighting, industrial gas-discharge plasma physics, and the high-power mercury-arc rectifiers that converted AC to DC for 20th-century electrified railways and power grids.

Peter Cooper Hewitt

Granted: September 17, 1901

US 706,737Electrification & Early Modern (1870–1920)

Low-Frequency Wireless Radiating Conductors

Distributed Capacity, Dynamo Resonance, and Direct-Action Electromagnetic Receivers

Reginald A. Fessenden's 1902 grant concerns lower-frequency electromagnetic-wave transmission: increasing a sending conductor's capacity and self-induction, its radiating portion, and the relation of an alternating-voltage source to the conductor's natural period. The printed claims run from distributed capacity through coordinated source-and-radiator systems.

Reginald Aubrey Fessenden

Granted: August 12, 1902

US 727,650Gilded Age & Grid (1870–1900)

Linde Regenerative Air Liquefaction and Separation

Pressure-Drop Cooling, Counter-Current Heat Exchange, and Fractional Distillation

Filed July 9, 1895 and granted May 12, 1903, US 727,650 covers Carl Linde’s process for producing low temperatures, liquefying gases, and separating the constituents of gaseous mixtures. The specification uses a compressor, a cooler, a long insulated counter-current apparatus, and a regulated pressure drop to keep returning low-pressure gas in thermal exchange with incoming high-pressure gas. It gives 75 atmospheres high pressure, 25 atmospheres low pressure, and cooling to about 10 degrees centigrade or less as an effective air-liquefaction example, then describes fractionating the liquid so nitrogen and oxygen may be taken off through further heat-exchange paths.

Carl Linde

Granted: May 12, 1903

US 808,897Progressive Era (1900–1920)

Wet-Plate Air Purifier

A sprayed-air washer with sinuous separator plates for particle and droplet removal

US 808,897 claims an air-purifying apparatus in which a fine spray wets suspended material and an upright, zigzag plate separator removes liquid and the material captured by it. This 1904 filing is specifically about the construction and action of the separator plates, rather than a later Carrier environmental-control system.

Willis H. Carrier

Granted: January 2, 1906

US 821,393Electrification & Early Modern (1870–1920)

Wright Flyer 3-Axis Aerodynamic Flight Control

Differential Wing Warping, Coordinated Rudder, and Aerodynamic Pitch Control

Orville Wright, Wilbur Wright

Granted: May 22, 1906

US 879,532Electrification & Early Modern (1870–1920)

Lee de Forest Audion Triode Vacuum Tube

Electrostatic Control Grid and Increased Sensitiveness in a Wireless Oscillation Detector

Lee de Forest's 1908 patent for a more sensitive wireless oscillation detector. It places a conducting member, optionally grid-shaped, between a heated filament and a second electrode inside an evacuated vessel, then connects the detector to an oscillation circuit and a local signal-indicating circuit. Later triode amplifiers built on this arrangement, but the grant itself is framed as a detector patent and supplies no general voltage, current, pressure, or gain rating.

Lee de Forest

Granted: February 18, 1908

US 942,699Electrification & Early Modern (1870–1920)

Phenol-Formaldehyde Insoluble Condensation Product

Water Separation, Forming, and Heat-and-Pressure Hardening

Leo Hendrik Baekeland's 1909 patent claims methods for reacting a phenolic body with formaldehyde, separating water from the resulting product, forming articles, and hardening the product with heat and pressure into a hard, insoluble, infusible body.

Leo Hendrik Baekeland

Granted: December 7, 1909

US 971,501Electrification & Early Modern (1870–1920)

Haber-Bosch Catalytic Ammonia Synthesis

Continuous High-Pressure Catalytic Hydrogenation of Atmospheric Nitrogen

Fritz Haber and Robert Le Rossignol's 1910 patent claims producing ammonia by passing gases containing nitrogen and hydrogen over osmium, with additional independent process variants using a heated catalyst, pressure, and pressure above 100 atmospheres. The specification reports an example using finely divided osmium at 175 atmospheres and about 550 degrees centigrade that produced eight percent by volume ammonia.

Fritz Haber, Robert Le Rossignol

Granted: September 27, 1910

US 1,102,653Early Rocket Research (1900–1920)

Solid-Charge Auxiliary Rocket

Tapered exhaust tube, spin-producing charges, and gyroscopic camera support

US 1,102,653 describes a solid-explosive rocket for carrying photographic or other recording instruments to extreme heights. Its disclosed apparatus uses a long tapered exhaust tube, electrically fired backward-curved spin charges, a smaller auxiliary rocket fired from a forward tube after the main charge is substantially consumed, and a gyroscope-supported camera that does not rotate with the spinning head.

Robert H. Goddard

Granted: July 7, 1914

US 1,773,980Electronic Era (1920–1960)

Farnsworth Electrical-Image Television System

Electrostatic image analysis, radio transmission, and optical reconstruction

US 1,773,980 discloses a television system in which a photo-electric cell forms an electrical image, two electrostatic analyzing potentials move that image across a fixed aperture, and the resulting light current and synchronizing signals are transmitted to an optical receiver. The grant’s receiver uses polarization, a light rotator, gratings, and two quartz oscillographs to reform the image.

Philo T. Farnsworth

Granted: August 26, 1930

US 1,781,541Industrial & Mass Production (1910–1940)

Einstein–Szilárd Absorption Refrigerator

Three-fluid absorption circuit with a heat-lifted return and partial-pressure evaporation

Albert Einstein, Leo Szilard

Granted: November 11, 1930

US 2,292,387Electronic Era (1920–1960)

Synchronized Frequency-Control Records

Matched perforated records change transmitter and receiver tuning together

Markey and Antheil's grant describes a radio-control system for a torpedo in which matched moving records change the transmitter and receiver tuning together. The illustrated arrangement uses seven selectable transmitting channels, four receiver channels, a warning lamp, and decoy transmissions.

Hedy Kiesler Markey, George Antheil

Granted: August 11, 1942

US 2,297,691Mid-Century Electronic, Nuclear & Materials Revolution (1920–1990)

Chester Carlson Electrophotography & Xerography

Photoconductive Latent Electrostatic Imaging, Triboelectric Powder Development & Heat Fusing

Chester F. Carlson's 1942 patent describes electrophotographic reproduction by charging a photoconductive insulating layer on a conductive backing, exposing it to a light image so illuminated areas discharge, developing the retained electrostatic image with fine powder, and transferring or fixing the resulting image on a receiving surface.

Chester F. Carlson

Granted: October 6, 1942

US 2,495,429Electronic Era (1920–1960)

Spencer's Microwave Food Treatment

Paired magnetrons, a common wave guide, and conveyor exposure at microwave wavelengths

US 2,495,429 claims methods for cooking food with microwave electromagnetic energy concentrated and guided in a restricted region. Spencer's illustrated apparatus uses two magnetron-type electron-discharge devices in push-pull, a common hollow wave guide, and a conveyor that carries food through the energy region. Claims 1–3 specify microwave-region energy; claims 4–6 state a wavelength of substantially ten centimetres.

Percy L. Spencer

Granted: January 24, 1950

US 2,524,035Semiconductor Revolution (1950–1975)

Bardeen and Brattain Point-Contact Transistor

Forward emitter injection and reverse collector capture in a semiconductor surface layer

US 2,524,035 claims a three-electrode semiconductor circuit element in which a forward-biased emitter supplies carriers through an opposite-type surface layer and a reverse-biased collector receives a portion of the resulting current. The application was filed June 17, 1948 and the grant issued October 3, 1950.

John Bardeen, Walter H. Brattain

Granted: October 3, 1950

US 2,543,181Post-War Boom & Atomic Age (1940–1969)

Edwin Land Polaroid Instant Photography

Diffusion Transfer Reversal, Viscous Alkaline Reagent Pods, and One-Step In-Camera Processing

Edwin H. Land's 1951 patent claims photographic products in which a photosensitive material, a receiving or base layer, and a container carrying processing liquid are attached as a unit. Applied stress ruptures the container without removing the ruptured portion and releases liquid between superposed layers, where the disclosed processing materials can develop an image and provide a transferred positive image.

Edwin H. Land

Granted: February 27, 1951

US 2,708,656Atomic & Space Age (1940–1970)

Fermi & Szilárd's Nuclear Reactor

Heterogeneous Graphite Moderator, Uranium Lattice, and Cadmium Control Rods

The Dawn of the Atomic Age: On December 19, 1944, Enrico Fermi and Leo Szilard filed US Patent No. 2,708,656 for the world's first artificial nuclear fission reactor (Chicago Pile-1). Solving the central puzzle of nuclear physics—how to sustain an atomic chain reaction using natural, un-enriched uranium (0.7% U-235)—Fermi and Szilard invented the heterogeneous lattice. By embedding discrete lumps of uranium inside high-purity graphite carbon, fast 2 MeV fission neutrons were slowed to thermal energies (0.025 eV) without getting swallowed by U-238 resonance traps, achieving a self-sustaining neutron reproduction factor

k_{eff} \ge 1.0

on December 2, 1942.

Enrico Fermi, Leo Szilard

Granted: May 17, 1955

US 2,929,922Mid-Century Electronic, Nuclear & Materials Revolution (1920–1990)

Townes & Schawlow Optical Maser & Laser

Stimulated Emission, Population Inversion & Fabry-Pérot Open Resonator Cavities

Charles Townes and Arthur Schawlow's historic 1960 master patent for the Optical Maser—the foundational intellectual property that gave birth to the LASER (Light Amplification by Stimulated Emission of Radiation). By replacing closed microwave resonant cavities with an open Fabry-Pérot resonator bounded by parallel plane mirrors, Townes and Schawlow solved the fundamental problem of mode selection at optical wavelengths, establishing the physics of population inversion, optical pumping, and coherent stimulated photon cascade that powers all modern fiber-optic communications, surgical lasers, barcode scanners, and semiconductor lithography.

Arthur L. Schawlow, Charles H. Townes

Granted: March 22, 1960

US 2,981,877Electronic Era (1920–1960)

Oxide-insulated semiconductor leads

Metal strips carried over surface-reaching P-N junctions by retained semiconductor oxide

US 2,981,877 describes semiconductor bodies whose surface-reaching P-N junctions remain covered by an oxide layer except at selected contacts. Metal strips adhere to that oxide and cross the junction without shorting it. The specification illustrates one transistor, a multi-device circuit, and a parallel-strip variant; the grant issued on April 25, 1961, from an application filed July 30, 1959.

Robert N. Noyce

Granted: April 25, 1961

US 3,138,743Mid-Century Electronic, Nuclear & Materials Revolution (1920–1990)

Jack Kilby Monolithic Integrated Circuit

Single-Crystal Semiconductor Substrate Integrating Transistors, Bulk Resistors, and P-N Junction Capacitors

Jack Kilby's historic 1964 master patent for Miniaturized Electronic Circuits—the foundational Texas Instruments breakthrough that invented the Monolithic Integrated Circuit (Microchip). Created during the famous 'monolithic idea' summer of 1958 at TI, Kilby realized that if all circuit components—active transistors and diodes, passive bulk resistors, and p-n junction capacitors—were fabricated entirely out of a single piece of semiconductor material (germanium or silicon), the 'Tyranny of Numbers' (interconnection failure) would be broken forever. Kilby demonstrated the first working monolithic integrated circuit (a phase-shift oscillator on a sliver of germanium) on September 12, 1958, sparking the microelectronics revolution that powers every computer, smartphone, and spacecraft on Earth.

Jack S. Kilby

Granted: June 23, 1964

US 3,353,115Mid-Century Computing & Space (1940–1970)

Maiman Ruby Laser & Solid-State Optical Maser

Synthetic Ruby, Optical Pumping, Three-Level Population Inversion, and Coherent Stimulated Emission

United States Patent 3,353,115 describes laser systems using a solid-state negative-temperature medium. In one example, a ruby rod is placed coaxially in a helical gas-filled flash tube. Broadband light pumps the active material from a ground level into a broad higher region, from which a radiationless transition feeds a discrete upper level. When the upper-state population exceeds the ground-state population, repeated reflections through the active material stimulate coherent monochromatic light, which is coupled out as a beam.

Theodore H. Maiman

Granted: November 14, 1967

US 3,541,541Information Age & Silicon Revolution (1960–1990)

Two-Wheel Position Indicator

Orthogonal wheel transducers for a CRT display system

US 3,541,541 describes a hand-held position indicator that rests on a surface. Two wheels on perpendicular axes drive transducer means; a flexible conductor carries the position signals to a computer that controls a cathode-ray-tube display. The grant also describes potentiometer, shaft-encoder, and incremental-encoder arrangements.

Douglas C. Engelbart

Granted: November 17, 1970

US 3,671,542Information Age (1960–1990)

Kwolek Kevlar Aromatic Polyamide Dopes

Source edition withheld pending a complete 58-page manual transcription

The grant's abstract describes optically anisotropic dopes made from carbocyclic aromatic polyamides in suitable liquid media and says those dopes are used to prepare fibers with unusual internal structure and high tensile properties. Its complete 58-page source face remains withheld until a literal manual edition is finished.

Stephanie Louise Kwolek

Granted: June 20, 1972

US 3,858,232Information Age (1960–1990)

Boyle & Smith Charge-Coupled Device (CCD)

Sequential Charge Packet Storage and Transfer Through Induced Semiconductor Potential Wells

United States Patent 3,858,232 discloses the Charge-Coupled Device (CCD), invented at Bell Telephone Laboratories by Willard S. Boyle and George E. Smith. The device stores and manipulates information in the form of discrete packets of minority charge carriers (photoelectrons) confined within mobile electrostatic potential energy wells created by an array of closely spaced MOS gate electrodes on a single-conductivity semiconductor substrate. By sequentially clocking adjacent electrode voltages, potential wells are deepened and collapsed in an overlapping sequence, smoothly transferring charge packets along a continuous channel with over 99.999% transfer efficiency. The CCD replaced bulky electron-beam vacuum tubes (vidicons) and magnetic storage with solid-state digital imaging, winning Boyle and Smith the 2009 Nobel Prize in Physics.

Willard S. Boyle, George E. Smith

Granted: December 31, 1974

US 4,136,359Information Age & Silicon Revolution (1960–1990)

Wozniak Video Timing and Color Circuit

A crystal-locked horizontal timing correction and recirculating shift-register generator for color graphics on a raster television display.

US 4,136,359 describes a microcomputer video circuit that derives color directly from recirculating digital bits. Its timing circuit operates horizontal synchronization at an odd submultiple of the chroma reference, then inserts a controlled delay to keep successive raster lines aligned in color phase.

Stephen G. Wozniak

Granted: January 23, 1979

US 6,120,588Internet & Modern Computing (1990–Present)

Jacobson Electronically Addressable Microencapsulated Ink

Electrophoretic Contrast Media, Printed Electronic Inks, and Addressable Displays

US Patent 6,120,588 describes electronically active ink systems and printing systems for laying down electronically addressable contrast media, conductors, insulators, resistors, semiconductive, magnetic, spin, piezoelectric, optoelectronic, thermoelectric, and radio-frequency materials in patterned structures.

Joseph M. Jacobson

Granted: September 19, 2000

US 6,285,999Internet & Modern Computing (1990–Present)

Google PageRank Algorithm

Stochastic Link Transition Eigenvector & Random Surfer Centrality

The Foundation of the Modern Internet Search Engine: Larry Page's 1998 patent revolutionized information retrieval by shifting the basis of relevance from simple on-page keyword matching to graph-theoretic link citation analysis. The PageRank algorithm models an idealized random surfer traversing the World Wide Web, calculating the stationary probability distribution of arriving at any given document.

Lawrence Page

Granted: September 4, 2001

US 6,331,181Internet & Modern Computing (1990–Present)

Robotic Surgical Tool Compatibility and Calibration Interface

Tool-Mounted Memory, Compatibility Signals, and Releasable Drive Interfaces

US 6,331,181 covers robotic surgical tools and system components that carry compatibility, tool-type, calibration, coupling, and tool-life information from a releasable tool interface to a processor. Its claims also cover driven tool interfaces, memory-stored offsets, engagement structures, and a magnetically actuated holder circuit, rather than a generic claim to every master-slave surgical robot.

Michael J. Tierney, Thomas G. Cooper, Chris A. Julian, Stephen J. Blumenkranz, Gary S. Guthart, Robert G. Younge

Granted: December 18, 2001

US 6,594,844Internet & Modern Computing (1990–Present)

Optical Cliff and Wall Detection for an Autonomous Cleaning Robot

Intersecting Emitter and Detector Fields for Surface-Height and Wall Sensing

US 6,594,844 protects a low-cost optical obstacle and wall detection system for an autonomous cleaning robot. An emitter's directed field intersects a photon's detector field at a finite region; the circuit uses the presence or absence of reflected signal to avoid stairs and unsuitable obstacles or to reacquire a wall with progressively smaller turning radii. The grant issued July 22, 2003 from an application filed January 24, 2001, claiming priority to provisional 60/177,703 filed January 24, 2000.

Joseph L. Jones

Granted: July 22, 2003

US 7,479,949Internet & Modern Computing (1990–Present)

Apple iPhone Multi-Touch Heuristics

Mutual Capacitance Matrix Shunts, Pinch-to-Zoom & Real-Time Affine Transformations

The Touch Interface Revolution: Often referred to as Steve Jobs's 'Steve Jobs patent', US 7,479,949 defined the software heuristics that turned raw multi-point capacitive sensor scans into natural touch gestures. By computing the dynamic Euclidean distance between simultaneous contact points, the iPhone introduced the iconic pinch-to-zoom scaling transformation that defined modern smartphones and tablets.

Steven P. Jobs, Scott Forstall, Greg Christie, J. Stephen Lemay, Scott Herz, Marcel Van Os, Bas Ording, Imran Chaudhri

Granted: January 20, 2009