The Integrated Circuit — Putting the Whole Transistor Radio on One Chip
Jack Kilby's 1964 monolithic integrated circuit patent at Texas Instruments — the invention that put multiple electronic components on a single piece of semiconductor, enabling the miniaturization of all modern electronics.
Original patent title: “Miniaturized electronic circuits”
What this patent covers
The actual claim
This patent describes a 'monolithic' integrated circuit — a device where multiple electronic components (transistors, resistors, capacitors) are all fabricated within a single continuous piece of semiconductor material, rather than as separate components wired together. The word 'monolithic' means 'one stone' — every component is made from the same slab of germanium or silicon. Tiny regions of the semiconductor are doped with different impurities to create transistors in some areas, resistors in others, and capacitors between conducting layers. Interconnecting wires are formed on the surface of the chip by depositing thin metal traces. The result is a complete electronic circuit in a package that can be manufactured automatically and made extremely small.
What this patent does NOT cover
The boundaries
- The planar process — Noyce's complementary patent (US2981877) covers the specific manufacturing technique that made ICs practical
- CMOS logic — the dominant IC technology today uses a different transistor type than Kilby's original
- Programmable chips (FPGAs, CPUs) — this patent covers the fabrication concept, not specific circuit architectures
- Packaging and interconnects between chips — this covers what's on a single semiconductor die, not how chips connect to each other
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
Kilby made his key insight in the summer of 1958, just two months after joining Texas Instruments — he was too new to the company to take the summer vacation that most employees took, so he worked alone in an empty lab. The established approach to electronic circuits was to build them from discrete components — each transistor, resistor, and capacitor was a separate manufactured part that had to be soldered together. The fundamental insight was that all of these components could be made from the same semiconductor material. Once you accept that, the entire circuit can be fabricated in one process, on one substrate. Kilby demonstrated his first working integrated circuit — a phase shift oscillator — on September 12, 1958. It was a tangled mess of wires and germanium, but it worked.
Schematic visualization of the patent's claim structure. Hand-drawn diagrams in progress for each landmark patent.
Where you've seen this
Real-world examples
Texas Instruments' first commercial product based on this patent was a hearing aid chip (1962), followed by the U.S. Air Force purchasing ICs for Minuteman missile guidance computers
The Apollo spacecraft's guidance computer used integrated circuits from Fairchild Semiconductor — buying enough of them to drive the price down from $1,000 per chip to $25
The Intel 4004 (1971) — the first microprocessor — contained 2,300 transistors on a single IC. The iPhone 15's A17 chip contains 19 billion.
Why it matters
The bigger picture
Kilby won the Nobel Prize in Physics in 2000, alongside Herbert Kroemer and Zhores Alferov. His co-inventor Robert Noyce (Fairchild, US2981877) had died in 1990 and was not eligible. The Nobel Committee's citation credited Kilby with 'his part in the invention of the integrated circuit.' The IC is the fundamental reason that computers went from buildings to desks to pockets. Moore's Law — the observation that the number of transistors on a chip doubles every two years — is a direct consequence of the integrated circuit enabling systematic miniaturization of the same basic structure Kilby patented.
Filed
February 6, 1959
Granted
June 23, 1964
Claim 1 — Plain English
What this patent covers
This patent describes a 'monolithic' integrated circuit — a device where multiple electronic components (transistors, resistors, capacitors) are all fabricated within a single continuous piece of semiconductor material, rather than as separate components wired together. The word 'monolithic' means 'one stone' — every component is made from the same slab of germanium or silicon. Tiny regions of the semiconductor are doped with different impurities to create transistors in some areas, resistors in others, and capacitors between conducting layers. Interconnecting wires are formed on the surface of the chip by depositing thin metal traces. The result is a complete electronic circuit in a package that can be manufactured automatically and made extremely small.
The clever bit
Kilby made his key insight in the summer of 1958, just two months after joining Texas Instruments — he was too new to the company to take the summer vacation that most employees took, so he worked alone in an empty lab. The established approach to electronic circuits was to build them from discrete components — each transistor, resistor, and capacitor was a separate manufactured part that had to be soldered together. The fundamental insight was that all of these components could be made from the same semiconductor material. Once you accept that, the entire circuit can be fabricated in one process, on one substrate. Kilby demonstrated his first working integrated circuit — a phase shift oscillator — on September 12, 1958. It was a tangled mess of wires and germanium, but it worked.
What it does not cover
- The planar process — Noyce's complementary patent (US2981877) covers the specific manufacturing technique that made ICs practical
- CMOS logic — the dominant IC technology today uses a different transistor type than Kilby's original
- Programmable chips (FPGAs, CPUs) — this patent covers the fabrication concept, not specific circuit architectures
- Packaging and interconnects between chips — this covers what's on a single semiconductor die, not how chips connect to each other
Patent Journey
From filing to expiry
Patent Filed
1959
Patent Granted
1964 · 5yr after filing
Patent Expired
1979
PatentBrief Score
Impact Score
Early stage
Citation count
29/40
Moderately cited
Claim breadth
1/20
Narrow claims
Recency
0/20
Older than 20 years
Assignee scale
0/20
Independent or smaller assignee
PatentBrief Impact Score — based on citation count, claim breadth, recency, and assignee scale. Not a legal assessment.
The original legal language
Original claims
2 claims as filed with the patent office.
Glossary
Key terms defined
- doping
- Adding controlled impurities to a semiconductor to create transistors, resistors, and other components within the same material
- substrate
- The semiconductor wafer (silicon or germanium) on which the integrated circuit is built
- monolithic
- Made from a single continuous piece of material — in an integrated circuit, all components are fabricated within one semiconductor substrate
Citations
Patent lineage
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