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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

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The United States Patent & Trademark Archive

Historical Specification & Engineering Broadside

Curated, Verified & Restored by Classic Patents (classic-patents.com)
SEMICONDUCTOR DEVICE-AND-LEAD STRUCTUREMetal strips carried over surface-reaching P-N junctions by retained semiconductor oxide
US 2,981,877Class: H01L 27/06 (Monolithic integrated circuits)
Inventor(s):Robert N. Noyce
Origin / Location:Los Altos, California
Grant & Filing:Filed July 30, 1959 · Granted April 25, 1961

I. Historical Context & Grant Summary

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.

II. Core Mechanism & Scientific Principles

Noyce's specification addresses a practical routing problem inside a semiconductor body. Contacts must reach selected P-type and N-type regions, yet a lead that crosses a surface-reaching P-N junction must not join the two sides electrically. The proposed construction retains an oxide of the semiconductor across the junction and places a metal strip on that insulating surface, opening the oxide only where a contact is intended.

Physical Operation:First form the semiconductor regions and their surface-reaching junctions. During diffusion in an oxidizing atmosphere, an oxide layer can form on the exposed silicon. Instead of stripping it away everywhere, clear only the chosen contact areas by photoengraving. Deposit metal over both the cleared areas and the remaining oxide, then remove unwanted metal. A strip on oxide can pass over a junction; a contact through a cleared window can reach a selected region. The patent's examples use this relationship for nested transistor contacts, a multi-device circuit, and parallel-strip contacts.
Governing Formulation:
Electrical insulation across a P-N junction:R_{\text{insulation}} = \rho_{\text{oxide}} \frac{t_{\text{oxide}}}{A_{\text{lead}}} \gg R_{\text{junction}}
Reverse-biased junction capacitance:C_j = \frac{\varepsilon A}{W} = A \sqrt{\frac{q \varepsilon N_A N_D}{2 (N_A + N_D) (V_0 + V_R)}}

III. The Granted Legal Monopoly (Key Claims)

Claim 1 (Independent)Oxide bridge across a P-N junction

Claim 1 protects the basic crossing: two closely spaced contacts on opposite sides of a surface-reaching P-N junction, with oxide retained across a different part of that junction so an adherent conductor can cross there and reach one contact. The legal function is to preserve separate contact access without shorting the junction.

Claim 2 (Independent)Nested extrinsic regions

Claim 2 narrows the crossing arrangement to nested extrinsic P and N regions. It requires ohmic contacts to the overlying and underlying regions, an oxide layer across their enclosing junction, and a metal strip that crosses the oxide while the second contact encircles the junction on both sides of that strip.

Claim 3 (Independent)Concentric discoid contact

Claim 3 specifies the concentric geometry shown in the drawings: a circular dished junction, a central discoid contact, and a surrounding C-shaped contact. The oxide passes through the C's gap, allowing a strip to cross the junction to the central contact while remaining insulated from the two C ends.

IV. Mechanical Organ Breakdown

Surface-reaching dished junctionsTerm: “Dished junction” → Surface-reaching P-N junction with a defined planar perimeter

A P-N boundary reaches the semiconductor surface, making its geometry available for both insulation and contact layout.

Oxide retained as a lead bridgeTerm: “Oxide layer congenitally united with the body” → Thermally formed insulating surface oxide

The oxide is not merely a coating to remove before contacting the silicon; it carries the crossing portion of a metal lead.

Contact windows, deposited metal, and photoengravingTerm: “Photoengraving” → Patterned resist-and-etch process

Selected oxide areas are cleared for contacts; the remaining oxide insulates metal strips laid across it.

Multi-device circuit and reverse-biased junctionsTerm: “Crystal diode rectifier” → P-N junction used for rectification

The larger example combines rectifying junctions, a transistor, resistive leads, and junction capacitances in one body.

CLASSIC PATENTS DIGITAL ARCHIVE • PERMANENT EXHIBIT ID: us-2981877-noyce-ic
classic-patents.com/patents/us-2981877-noyce-ic
Original USPTO PDF
Classic Patents/US 2,981,877
Electronic Era (1920–1960)Semiconductor Physics & Microelectronics

Oxide-insulated semiconductor leads

US 2,981,877

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

Inventor(s)Robert N. Noyce
Grant DateApril 25, 1961
Filing DateJuly 30, 1959
LocationLos Altos, California
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.
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

Noyce's specification addresses a practical routing problem inside a semiconductor body. Contacts must reach selected P-type and N-type regions, yet a lead that crosses a surface-reaching P-N junction must not join the two sides electrically. The proposed construction retains an oxide of the semiconductor across the junction and places a metal strip on that insulating surface, opening the oxide only where a contact is intended.
The Core Breakthrough Mechanism

First form the semiconductor regions and their surface-reaching junctions. During diffusion in an oxidizing atmosphere, an oxide layer can form on the exposed silicon. Instead of stripping it away everywhere, clear only the chosen contact areas by photoengraving. Deposit metal over both the cleared areas and the remaining oxide, then remove unwanted metal. A strip on oxide can pass over a junction; a contact through a cleared window can reach a selected region. The patent's examples use this relationship for nested transistor contacts, a multi-device circuit, and parallel-strip contacts.

Interactive Real-Time Physical Simulation

Drag to rotate · Pinch to zoom · Shared controls update the displayed model
INITIALIZING THREE.JS WEBGL SIMULATION...
Oxide-Insulated Planar Junction Lead Topology.
Host-Model Telemetry/Computed Readout
Oxide-Insulated Planar Junction Lead Topology
Oxide Thickness
Reader Scenario
1.0µm[L]
Lead Route
Normalized
0.12contact span[1]
Claim 1 Crossing
Source Refusal
oxide-supported[1]
Electrical Performance
Source Refusal
refused[1]
Displayed Oxide Thickness
∂t_{oxide,display} / ∂t_{oxide,reader} (host sensitivity)
1 µm / µm
Oxide Thickness1 µm
Lead Width / Contact Span0.12 fraction
Interval ghosts
t_ox1.0 µm · [0.5, 2]
w_lead0.1 span fraction · [0.08, 0.28]
Fidelity / MMS residual
Displayed oxide vs printed example range
model1000 nm
reference1000–2000 nm
residualwithin source range nm
Dated scenarios

Detailed Component Architecture

1Surface-reaching dished junctions
A P-N boundary reaches the semiconductor surface, making its geometry available for both insulation and contact layout.

The source calls several such boundaries dished junctions. In the single-transistor example, circular surface edges let a central contact and a surrounding C-shaped contact reach different regions. The important constraint is geometric: contacts on opposite sides of the junction remain separate while the oxide crosses another portion of that same boundary.

19th-C. Term: Dished junctionModern: Surface-reaching P-N junction with a defined planar perimeter
2Oxide retained as a lead bridge
The oxide is not merely a coating to remove before contacting the silicon; it carries the crossing portion of a metal lead.

The specification describes an insulating layer consisting essentially of oxide of the semiconductor, adherent to the surface and extending across the junction. In the illustrated single-transistor structure, oxide tongues bridge the nested junction edges. The patent reports that the oxide layer may be about one or two microns thick in that example, while making no general performance claim for every device made by the process.

19th-C. Term: Oxide layer congenitally united with the bodyModern: Thermally formed insulating surface oxide
3Contact windows, deposited metal, and photoengraving
Selected oxide areas are cleared for contacts; the remaining oxide insulates metal strips laid across it.

The source permits vacuum deposition through a mask or deposition followed by photoengraving away unwanted metal. It also describes alloying aluminum contacts to silicon to make ohmic contacts. These are alternative fabrication routes in the specification, not a claim that every later integrated circuit uses the same materials, temperatures, or dimensions.

19th-C. Term: PhotoengravingModern: Patterned resist-and-etch process
4Multi-device circuit and reverse-biased junctions
The larger example combines rectifying junctions, a transistor, resistive leads, and junction capacitances in one body.

In Figs. 3 through 5, the source treats junctions 14 and 15 as rectifiers and explains that a reverse-biased junction 18, and later junction 22, acts as a capacitance. It is an illustrative detector, filtering, and transistor-amplifier arrangement. The patent does not state an operating frequency, clock rate, dopant concentration, or a universal speed limit for the arrangement.

19th-C. Term: Crystal diode rectifierModern: P-N junction used for rectification
Engineering Principles & Equations

Governing Equations & Engineering Principles

Authored explanation paired with its stated mathematical relation

Claim 1: Oxide-Supported Junction Crossing

Source-Bound Semiconductor GeometryClaim 1
Mathematical Governing Law
Terms:
Plain English DecoderHover or tap any highlighted phrase
Claim 1 keeps a across part of a surface-reaching P-N junction so an can make an to one selected contact without joining the other side of the junction.
oxideoxide
Retained semiconductor oxide
The oxide of the semiconductor that remains adherent to the surface and crosses the relevant junction portion in Claim 1.
source construction element

The source uses the oxide as the insulating support under the crossing part of the lead. In the illustrated transistor example it says the oxide may be about one or two microns thick; it supplies no general electrical-performance value.

Physical Principle & Engineering Insight

This is a Claim 1 construction relation, not a quantitative device law. US 2,981,877 does not print a bias voltage, dopant concentration, depletion width, capacitance, clock frequency, delay, breakdown limit, package, or switching-performance measurement for the illustrated structures.

Historical Context: The card directs the reader to the source's actual legal relation: retained oxide separates a crossing metal strip from a surface-reaching P-N junction while contact windows reach selected regions.

Electrical insulation across a P-N junctionAuthored Principle 1
Stated relationRinsulation=ρoxidetoxideAlead≫RjunctionR_{\text{insulation}} = \rho_{\text{oxide}} \frac{t_{\text{oxide}}}{A_{\text{lead}}} \gg R_{\text{junction}}
A conducting strip can cross the map of a junction only when the strip is kept electrically separate from the semiconductor below it. Here that separation comes from a retained oxide layer. The patent gives geometry and fabrication relationships, not a source equation for capacitance, depletion width, or breakdown voltage.
Reverse-biased junction capacitanceAuthored Principle 2
Stated relationCj=εAW=AqεNAND2(NA+ND)(V0+VR)C_j = \frac{\varepsilon A}{W} = A \sqrt{\frac{q \varepsilon N_A N_D}{2 (N_A + N_D) (V_0 + V_R)}}
The specification expressly uses reverse-biased junctions 18 and 22 as capacitances in the illustrated circuit. It explains the effect through charge layers on both sides of the junction and says the value at junction 18 can be varied by changing its area. No numeric capacitance value or bias voltage is printed in the grant.

Interactive Schematic Sheet (Fig. 1)

Greatly enlarged plan view of one transistor-and-lead structure described in the specification.

1.00x
US 2,981,877 · FIG. 1Pinned facsimile crop · Fig. 1
Tap any numbered pin2 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 document is valuable because it makes the routing constraint visible in concrete layouts: a lead can cross an insulating oxide where a P-N junction reaches the surface, while selected windows still provide contact to particular semiconductor regions. The original text shows the legal and geometric details behind that idea rather than treating the patent as a generic history of all later microelectronics.

Legal Claims Decoder (10 Numbered Claims)

Compare dense legalistic claims directly with decoded plain-English functional specifications.
Claim #1Independent Master Claim
1/10
Verbatim Historical Legal Text
“A semiconductor device comprising a body of semiconductor having a surface, said body containing adjacent P-type and N-type regions with a junction therebetween extending to said surface, two closely spaced contacts adherent to said surface upon opposite sides of and adjacent to one portion of said junction, an insulating layer consisting essentially of oxide of said semiconductor on and adherent to said surface, said layer extending across a different portion of said junction, and an electrical connection to one of said contacts comprising a conductor adherent to said layer, said conductor extending from said one contact over said layer across said different portion of the junction, thereby providing electrical connections to both of the closely spaced contacts.”
Plain English Engineering Translation
Claim 1 protects the basic crossing: two closely spaced contacts on opposite sides of a surface-reaching P-N junction, with oxide retained across a different part of that junction so an adherent conductor can cross there and reach one contact. The legal function is to preserve separate contact access without shorting the junction.
Key Protected Innovations:
Oxide bridge across a P-N junctionTwo-sided contact accessAdherent crossing conductor

The Historical Bottleneck

The specification identifies the problem as making electrical connections to semiconductor regions while building compact unitary circuit structures that can include numerous devices in one body of material.

Why Prior Art Failed

  • •The source says prior practice removed the oxide layer after diffusion except where contacts were to be made, losing the insulating surface needed for a lead to cross a junction.
  • •The source describes the difficulty of attaching external leads directly to small emitter and base contacts without damaging the semiconductor body through applied heat or pressure.
The Breakthrough Insight
“Retain the semiconductor oxide across selected junction edges and use it as the insulating support for deposited metal strips, while clearing only the contact areas that need direct electrical connection.”
After the Grant
The patent issued on April 25, 1961. This catalogue does not infer a litigation result, a priority award, or a later-product lineage from the grant alone.
Civilizational Impact
The grant provides a primary-source record of a planar semiconductor lead structure: its legal scope, figure geometry, fabrication alternatives, and the illustrative multi-device circuit are available together for close technical reading.
Technological Lineage & Descent

The Silicon Microelectronics Revolution

From Punched-Card Tabulators to Multi-Touch Human Interfaces

The digital computation lineage that replaced mechanical gear teeth with point-contact semiconductor switches, monolithic planar circuits, personal computers, and touch glass.

1889Electromechanical Data Storage
US 395,781

Record-Card Statistical Compiler

Conductive mercury cup contacts sensing punched holes in structured card records.

1950Solid-State Transistor Origin
US 2,524,035

Bardeen and Brattain Point-Contact Transistor

Point-contact emitter/collector gold cat-whiskers modulating minority carrier diffusion.

1961Planar Monolithic CircuitThis Patent
US 2,981,877

Oxide-insulated semiconductor leads

Oxide passivation, photolithographic isolation, and evaporated aluminium leads on silicon.

1964Miniaturized Solid Circuit
US 3,138,743

Jack Kilby Monolithic Integrated Circuit

Semiconductor wafer containing active transistors and passive resistive components.

1970Interactive Spatial Input
US 3,541,541

Two-Wheel Position Indicator

Orthogonal rolling wheels driving potentiometers to translate hand motion to screen cursor.

1979Integrated Microcomputer
US 4,136,359

Wozniak Video Timing and Color Circuit

Shared-RAM timing generator enabling flicker-free color microprocessor video generation.

2001Global Information Graph
US 6,285,999

Google PageRank Algorithm

Eigenvector centrality algorithm weighting web document importance by hyperlink graph.

2009Capacitive Gestural Surface
US 7,479,949

Apple iPhone Multi-Touch Heuristics

Mutual capacitance sensor matrix resolving concurrent discrete finger touch trajectories.