US3344324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unipolar transistor with narrow channel between source and drain
Assignee: Philips North America LLC
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Filing: 1957-11-29
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Granted: 1967-09-26
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Expires: 1977-11-29
Abstract
No abstract record available.
Inventors
- 👤 Beale Julian Robert Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:56
CPC Classifications
H; H10; H10W; H10W20/00; H10W20/40; A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2013; A61K9/2022; A61K9/2063; A61K9/2072; A61K9/2086; A61K9/209; A61K9/28; H10D; H10D99/00; H10P; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A FIELD-EFFECT TRANSISTOR COMPRISING A BODY OF SEMICONDUCTIVE MATERIAL, A SURFACE LAYER ON SAID BODY OF ONE CONDUCTIVITY TYPE WHOSE CONDUCTIVITY AT THE SURFACE IS HIGH AND WHOSE CONDUCTIVITY INWARD OF THE SAID SURFACE IS LOW, SPACED SOURCE AND DRAIN ELECTRODE CONNECTIONS TO SAID SURFACE LAYER AT HIGH-CONDUCTIVE SURFACE BODY PORTIONS, A REGION OF THE OPPOSITE CONDUCTIVITY TYPE IN SAID BODY AND SPACED FROM THE SAID SURFACE AND THE SOURCE AND DRAIN ELECTRODES, AND A GATE ELECTRODE CONNECTION TO SAID REGION OF THE OPPOSITE CONDUCTIVITY TYPE, SAID SURFACE LAYER HAVING AN INTERRUPTION BETWEEN THE SOURCE AND DRAIN ELECTRODES AND EXTENDING INWARD FROM THE HIGHCONDUCTIVE SURFACE INTO LOW-CONDUCTIVE BODY PORTIONS.
Claim 2
Dependent Claim
109 words
A FIELD-EFFECT TRANSISTOR COMPRISING A BODY OF SEMICONDUCTIVE MATERIAL, A SURFACE LAYER ON SAID BODY OF ONE CONDUCTIVITY TYPE WHOSE CONDUCTIVITY AT THE SURFACE IS HIGH AND WHOSE CONDUCTIVITY INWARD OF THE SAID SURFACE IS LOW, SPACED SOURCE AND DRAIN ELECTRODE CONNECTIONS TO SAID SURFACE LAYER AT HIGH-CONDUCTIVE SURFACE BODY PORTIONS, A REGION OF THE OPPOSITE CONDUCTIVITY TYPE IN SAID BODY AND SPACED FROM THE SAID SURFACE AND THE SOURCE AND DRAIN ELECTRODES, AND A GATE ELECTRODE CONNECTION TO SAID REGION OF THE OPPOSITE CONDUCTIVITY TYPE, SAID SURFACE LAYER HAVING AN INTERRUPTION BETWEEN THE SOURCE AND DRAIN ELECTRODES AND EXTENDING INWARD FROM THE HIGHCONDUCTIVE SURFACE INTO LOW-CONDUCTIVE BODY PORTIONS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |