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Archaic Legal Glossary & Citations

“Letters Patent”14th–20th Century
19th-C Meaning:

Open public letters from a monarch or government (literae patentes) granting monopoly rights.

Modern Engineering Decoded:Issued USPTO utility or design patent publication.
Historical note: Contrasted with 'letters close' (private sealed royal correspondence).
“In testimony whereof”19th Century
19th-C Meaning:

Formal concluding legal formula affirming under oath the execution of the instrument.

Modern Engineering Decoded:Inventor and witness digital/physical signatures.
Historical note: Required two witness attestations in 19th-century USPTO filing procedure.
“Aeroplane”Early 20th Century (Wright era)
19th-C Meaning:

A flat or cambered lifting aerofoil surface supported dynamically by air pressure.

Modern Engineering Decoded:Wing / Airfoil lifting surface (later evolved to mean the entire motorized aircraft).
Historical note: The Wrights used 'aeroplane' to denote the individual fabric-covered wings.
“Undulating Current”19th Century (Bell era)
19th-C Meaning:

An electric current whose magnitude varies continuously and periodically without interruption.

Modern Engineering Decoded:Continuous analog AC or audio-frequency electrical waveform.
Historical note: Bell's central legal weapon against telegraph companies who relied on pulsed DC make-and-break circuits.
“Subdivision of the Electric Light”1870s–1880s (Edison era)
19th-C Meaning:

The problem of operating numerous small domestic lamps off a single electrical generator.

Modern Engineering Decoded:Parallel circuit wiring of high-resistance incandescent electrical loads.
Historical note: Pundits claimed it was physically impossible until Edison increased filament resistance to 100 ohms.
“Optically Anisotropic Solution”1960s (Kwolek era)
19th-C Meaning:

A liquid solution that exhibits direction-dependent refractive indices due to molecular alignment.

Modern Engineering Decoded:Liquid crystalline nematic phase polymer dope.
Historical note: Technicians initially tried to throw out Kwolek's cloudy solution thinking it was contaminated.
“Unitary Body of Semiconductor Material”1950s–1960s (Noyce era)
19th-C Meaning:

A single continuous crystal structure of silicon or germanium.

Modern Engineering Decoded:Monolithic single-crystal silicon die / integrated circuit wafer.
Historical note: Differentiated Noyce's monolithic planar circuit from Jack Kilby's hybrid flying-wire prototype.
“Peculiar and Novel Construction”19th Century
19th-C Meaning:

A distinctive, patentable structural arrangement not found in prior art.

Modern Engineering Decoded:Novel and non-obvious mechanical embodiment under 35 U.S.C. § 103.
Historical note: Standard 19th-century legal terminology establishing novelty.

Museum Broadside & Archival Print Edition

Authentic archival layout formatted for framing, study, and high-resolution printing

Paper:
Theme:
The United States Patent & Trademark Archive

Historical Specification & Engineering Broadside

Curated, Verified & Restored by Classic Patents (classic-patents.com)
SECRET COMMUNICATION SYSTEMMatched perforated records change transmitter and receiver tuning together
US 2,292,387Class: Cl. 250-2 (as printed in the grant)
Inventor(s):Hedy Kiesler Markey, George Antheil
Origin / Location:Los Angeles and Manhattan Beach, California
Grant & Filing:Filed June 10, 1941 · Granted August 11, 1942

I. Historical Context & Grant Summary

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.

II. Core Mechanism & Scientific Principles

The grant addresses a radio-controlled torpedo whose control frequency could be discovered and imitated. Its illustrated solution is not a single fixed channel: a transmitting station and a receiver use matched moving records to change their tuning in step. The drawings show seven selectable transmitter frequencies, four receiver frequencies, and additional transmitter channels used for false impulses. A contemporary player-piano roll is discussed as a possible physical record, but the illustrated apparatus remains the seven-channel transmitter/four-channel receiver arrangement.

Physical Operation:The two records are held at their starting holes, then released together when the torpedo is fired. As a perforation reaches a control-head passage, the pneumatic mechanism lets a spring close a selected tuning switch. At the transmitter, that connects one of capacitors 24a through 24g to oscillator 20; at the receiver, a matching record controls selector 61. A 100-cycle modulation tone produces a one-step left-rudder command, while a 500-cycle tone produces a one-step right-rudder command. The lamp on row H tells the operator when a transmission is a false signal or falls between usable channels.
Governing Formulation:
Synchronized selection:t_sync = t_tx - t_rx = 0
Selective tuning:f_k = 1 / (2 * pi * sqrt(L * C_k))
Tone selection and ratchet motion:f_mod -> magnet -> delta_theta

III. The Granted Legal Monopoly (Key Claims)

Claim 1 (Independent)synchronized record strips

This principal claim requires both ends of the radio link. The transmitter generates and sends one of several carrier frequencies, while its first moving record strip passes differently characterized longitudinal recordings over selective actuators that choose the carrier frequency. The receiver has tuning means for those same carrier frequencies and a second moving strip with its own selective actuators. The two strips move in synchronism, so their corresponding record positions keep the receiver tuned to the transmitter as the carrier changes over time.

Claim 2 (Dependent)laterally positioned recordings

This narrows claim 1 to records whose different control positions are distinguished by lateral placement across the strip.

Claim 3 (Dependent)slotted ribbon

This dependent claim chooses a particular physical form for claim 1's record: a ribbon with longitudinal slots placed at different lateral positions. Its reader has several movable elements, each associated with a different generator or receiver tuning state. The lateral position of a slot selects which element moves, and therefore which frequency-setting element is engaged.

IV. Mechanical Organ Breakdown

Synchronous record stripsTerm: “record strip” → a physical sequence that selects one tuning state after another

A record at each station selects tuning positions as it moves over its own control head.

Variable-frequency transmitting stationTerm: “tuning condensers” → selectable capacitors that change an oscillator's tuned frequency

Oscillator 20, modulator 21, amplifier 22, and antenna 23 form the illustrated transmitting station.

Record-responsive pneumatic switchingTerm: “record-actuated means” → a reader that converts the position of a paper perforation into a switching action

Perforations in strip 37 determine which tuning switch closes.

Receiver and incremental rudder controlTerm: “pawl” → a tooth-engaging lever that advances a ratchet by one step

The receiver separates two modulation tones and advances the rudder one ratchet increment per received command.

CLASSIC PATENTS DIGITAL ARCHIVE • PERMANENT EXHIBIT ID: us-2292387-lamarr-frequency-hopping
classic-patents.com/patents/us-2292387-lamarr-frequency-hopping
Original USPTO PDF
Classic Patents/US 2,292,387
Electronic Era (1920–1960)Radio Control & Secret Communication

Synchronized Frequency-Control Records

US 2,292,387

Matched perforated records change transmitter and receiver tuning together

Inventor(s)Hedy Kiesler Markey, George Antheil
Grant DateAugust 11, 1942
Filing DateJune 10, 1941
LocationLos Angeles and Manhattan Beach, California
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.
USPTO PDF
Audio Engineering Breakdown~2 min listen

Listen to the narrated mechanical breakdown and civilizational context

Engineering Analysis & Physical Principles

How It Works: Step-by-Step Mechanical & Physical Breakdown

The grant addresses a radio-controlled torpedo whose control frequency could be discovered and imitated. Its illustrated solution is not a single fixed channel: a transmitting station and a receiver use matched moving records to change their tuning in step. The drawings show seven selectable transmitter frequencies, four receiver frequencies, and additional transmitter channels used for false impulses. A contemporary player-piano roll is discussed as a possible physical record, but the illustrated apparatus remains the seven-channel transmitter/four-channel receiver arrangement.
The Core Breakthrough Mechanism

The two records are held at their starting holes, then released together when the torpedo is fired. As a perforation reaches a control-head passage, the pneumatic mechanism lets a spring close a selected tuning switch. At the transmitter, that connects one of capacitors 24a through 24g to oscillator 20; at the receiver, a matching record controls selector 61. A 100-cycle modulation tone produces a one-step left-rudder command, while a 500-cycle tone produces a one-step right-rudder command. The lamp on row H tells the operator when a transmission is a false signal or falls between usable channels.

Interactive Real-Time Physical Simulation

Drag to rotate · Pinch to zoom · Shared controls update the displayed model
INITIALIZING THREE.JS WEBGL SIMULATION...
Synchronized record-controlled radio tuning.
Host-Model Telemetry/Computed Readout
Synchronized record-controlled radio tuning
Transmitter record row
Source
AA–G[1]
Receiver match
Source
A–C falsechannels[1]
Command label
Source
100cycles[1]
Warning lamp 43
Source
onrow H[1]
Jamming Processing Gain
∂G_p / ∂N (host sensitivity)
0.22 dB / channel
Matched record position0 row
Command tone (100 or 500 cycles)100 cycles
Interval ghosts
G_p0.0 dB · [10, 35]
Fidelity / MMS residual
Hop set vs 88-key piano roll
model7 keys
reference88 keys
residual-81 keys
Coupled channels
pneumatic tape → carrier frequency hop46 W
Dated scenarios
Piano-roll hop grid

Detailed Component Architecture

1Synchronous record strips
A record at each station selects tuning positions as it moves over its own control head.

The records are held by pins in special starting holes and released simultaneously when the torpedo is fired. The specification permits constant-speed clock motors and also permits periodic correction of the receiving record by synchronizing impulses.

19th-C. Term: record stripModern: a physical sequence that selects one tuning state after another
2Variable-frequency transmitting station
Oscillator 20, modulator 21, amplifier 22, and antenna 23 form the illustrated transmitting station.

Seven tuning condensers, 24a through 24g, have different capacities and are independently connected to oscillator 20 by switches 31. The illustrated apparatus therefore selects seven transmitter frequencies; the possible record formats discussed elsewhere do not change that illustrated count.

19th-C. Term: tuning condensersModern: selectable capacitors that change an oscillator's tuned frequency
3Record-responsive pneumatic switching
Perforations in strip 37 determine which tuning switch closes.

A solid section of paper lets suction lift piston 53 and leave switch 31 open. A hole admits air through passage 46, breaks that suction, and lets spring 53a close the switch. Different rows bring different capacitors into circuit in whatever order the record provides.

19th-C. Term: record-actuated meansModern: a reader that converts the position of a paper perforation into a switching action
4Receiver and incremental rudder control
The receiver separates two modulation tones and advances the rudder one ratchet increment per received command.

Selector 61 is tuned by four capacitors, 24'd through 24'g. A received 100-cycle tone reaches filter 166 and drives the left-rudder pawl; a 500-cycle tone reaches filter 566 and drives the right-rudder pawl. The brake band holds the rudder after a step. The grant describes discrete increments, not proportional servo control.

19th-C. Term: pawlModern: a tooth-engaging lever that advances a ratchet by one step
Engineering Principles & Equations

Governing Equations & Engineering Principles

Authored explanation paired with its stated mathematical relation

Claim 1: Synchronized Record-Selected Tuning

Source-Bound Radio ControlClaim 1
Mathematical Governing Law
Terms:
Plain English DecoderHover or tap any highlighted phrase
Claim 1 pairs a that selects transmitter tuning with a that selects receiver tuning. Their keeps the receiver tuned to the transmitter's selected carrier frequency.
firstrecordstripfirst record strip
First record strip
Claim 1's elongated transmitting-station record whose recordings select carrier frequency.
Claim 1 selecting element

The claim requires a moving first strip and record-actuated means that determine the transmitter's carrier frequency from its recordings; it states no numeric channel count or hopping rate.

Physical Principle & Engineering Insight

This card is limited to Claim 1's two record strips, their selecting mechanisms, and the synchronism condition. The scholarly source edition remains under independent review, so this page does not present a source-backed hop rate, bandwidth, processing gain, jamming margin, or later-network performance model.

Historical Context: The card identifies the claimed matched-record tuning relationship without treating later spread-spectrum metrics as measurements in the 1942 grant.

Synchronized selectionAuthored Principle 1
Stated relationtsync=ttx−trx=0t_sync = t_tx - t_rx = 0
The functional requirement is phase agreement between the two moving records: corresponding perforations must reach their control heads together, so the receiver follows the transmitter's selected carrier frequency.
Selective tuningAuthored Principle 2
Stated relationfk=1/(2∗pi∗sqrt(L∗Ck))f_k = 1 / (2 * pi * sqrt(L * C_k))
Different capacitor capacities give oscillator 20 and selector 61 different tuned states. The record-controlled switches choose among those states; the specification says the order can be arbitrary rather than periodically recurring.
Tone selection and ratchet motionAuthored Principle 3
Stated relationfmod−>magnet−>deltathetaf_mod -> magnet -> delta_theta
The two printed modulation frequencies serve as distinct command labels after detection. Separate filters, magnets, and pawls turn those labels into one-step left or right rudder movement.

Interactive Schematic Sheet (Fig. 1)

Schematic diagram of oscillator 20, modulator 21, amplifier 22, antenna 23, tuning condensers 24a through 24g, and record strip 37 at the transmitting station.

1.00x
US 2,292,387 · FIG. 188-slot piano-roll hop sequence
Tap any numbered pin0 Curated Callouts
Callout Pin Inspector

Select Any Numbered Pin

Click pins on the schematic or select from the list below to inspect historical specifications.

Why It Still Matters

The grant is a detailed historical record of a frequency-changing radio-control proposal: matched records select tuning states, false channels can be transmitted, and short commands change a craft's rudder by discrete increments. Claims 1 through 6 define that apparatus, its laterally positioned records, movable craft control, incremental action, and transmitter-side decoy indication.

Legal Claims Decoder (6 Numbered Claims)

Compare dense legalistic claims directly with decoded plain-English functional specifications.
Claim #1Independent Master Claim
1/6
Verbatim Historical Legal Text
“In a secret communication system, a transmitting station including means for generating and transmitting carrier waves of a plurality of frequencies, a first elongated record strip having differently characterized, longitudinally disposed recordings thereon, record-actuated means selectively responsive to different ones of said recordings for determining the frequency of said carrier waves, means for moving said strip past said record-actuated means whereby the carrier wave frequency is changed from time to time in accordance with the recordings on said strip, a receiving station including carrier wave-receiving means having tuning means tunable to said carrier wave frequencies, a second record strip, record-actuated means selectively responsive to different recordings on said second record strip for tuning said receiver to said predetermined carrier frequencies, and means for moving said second strip past its associated record-actuated means in synchronism with said first strip, whereby the record-actuated means at the transmitting station and at the receiving station, respectively, are actuated in synchronism to maintain the receiver tuned to the carrier frequency of the transmitter.”
Plain English Engineering Translation
This principal claim requires both ends of the radio link. The transmitter generates and sends one of several carrier frequencies, while its first moving record strip passes differently characterized longitudinal recordings over selective actuators that choose the carrier frequency. The receiver has tuning means for those same carrier frequencies and a second moving strip with its own selective actuators. The two strips move in synchronism, so their corresponding record positions keep the receiver tuned to the transmitter as the carrier changes over time.
Key Protected Innovations:
synchronized record stripsselective frequency tuningcoordinated transmitter and receiver

The Historical Bottleneck

The specification says that an enemy could discover the frequency used for remote control and then send false signals on that frequency, potentially blocking the control of a dirigible craft such as a torpedo.

Why Prior Art Failed

  • •The inventors state that remote control of a torpedo was already old and does not broadly form part of their invention.
  • •The grant identifies discovery and imitation of the control frequency as the weakness of a fixed-frequency control arrangement.
The Breakthrough Insight
“The grant's stated contribution is a variable-frequency transmitting station and a correspondingly variable receiver controlled by synchronized records. In the illustrated arrangement, some transmitter frequencies intentionally do not correspond to a receiver setting and serve as false impulses.”
Civilizational Impact
The document records a 1941 filing for a radio-control apparatus that changes tuning through synchronized record positions, permits false transmissions, and moves a craft's rudder in discrete increments. Its asserted legal scope is stated in claims 1 through 6.
Technological Lineage & Descent

Signal Transmission & Electronic Media

From Binary Wire Telegraphy to Packet-Switched Ethernet

The unbroken electrical signal lineage through binary wire signaling, analog acoustic current modulation, spark wireless, triode amplification, electronic television, and multipoint computer packet networking.

1840Binary Telegraph Origin
US 1,647

Morse Electro-Magnetic Telegraph

Electromagnetic sounder, galvanic battery relay, and binary dot-dash dot coding.

1876Acoustic Audio Modulation
US 174,465

Bell Telephone

Liquid transmitter variable resistance converting sound pressure to undulating current.

1880Free-Space Optical Beam
US 235,199

Bell & Tainter Photophone Optical Wireless Communication

Modulated sunlight beam reflected off voice diaphragm onto photoconductive selenium.

1897Syntonic Wireless Telegraphy
US 586,193

Marconi Spark-Oscillation Receiver and Reset Mechanism

Spark gap dipole radiator, elevated aerial wire, and tuned coherer RF reception.

1902Continuous-Wave Modulation
US 706,737

Low-Frequency Wireless Radiating Conductors

High-frequency continuous sine-wave carrier modulated by acoustic speech signals.

1908Active Triode Amplification
US 879,532

Lee de Forest Audion Triode Vacuum Tube

Third perforated control grid modulating cathode-to-anode vacuum electron flow.

1930All-Electronic Video Raster
US 1,773,980

Farnsworth Electrical-Image Television System

Continuous photoelectric cathode scanning image dissector without mechanical wheels.

1942Spread-Spectrum ArchitectureThis Patent
US 2,292,387

Synchronized Frequency-Control Records

Synchronized punched-tape hopping across 88 carrier frequencies to resist jamming.

1977Local Network Packet Grid
US 4,063,220

Ethernet Local Area Network (CSMA/CD)

Carrier-sense multiple access with collision detection (CSMA/CD) packet broadcasting.