US3253196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unijunction transistors
Assignee: General Electric Co
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Filing: 1962-03-23
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Granted: 1966-05-24
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Expires: 1982-03-23
Abstract
No abstract record available.
Inventors
- 👤 Tage P Sylvan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:41
CPC Classifications
H; H10; H10W; H10W76/00; H10W76/10; H10W76/12; H10W76/13; H10W76/132; H10D; H10D99/00; H10W72/00; H10W72/071; H10W72/075; H10W72/07551; H10W72/07552; H10W72/50; H10W72/521; H10W72/527; H10W72/531; H10W72/536; H10W72/5363; H10W72/551; H10W72/552; H10W72/5522; H10W72/5524; H10W72/851; H10W72/874; H10W72/884; H10W72/90; H10W72/951; H10W72/952; H10W90/00; H10W90/701; H10W90/751; H10W90/754
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN A UNIJUNCTION TRANSISTOR INCLUDING A BODY OF SEMICONDUCTOR MATERIAL OF ONE CONDUCTIVITY TYPE HAVING A PAIR OF BASE ELECTRODES SPACED ON SAID BODY AND MAKING NONRECTIFYING CONTACT THEREWITH; THE IMPROVEMENT WHICH COMPRISES ONE OF SAID BASE ELECTRODES BEING SMALL IN AREAS OF CONTACT IN RELATION TO THE DIMENSIONS OF SAID BODY AND IN RELATION TO THE AREA OF CONTACT OF SAID OTHER BASE ELECTRODE; AND AN ADDITIONAL ELECTRODE MAKING RECITFYING CONTACT WITH SAID BODY AND BEING SPACED CLOSER TO SAID ONE BASE ELECTRODE THAN TO SAID OTHER ELECTRODE; THAT PORTION OF SAID BODY BETWEEN SAID ONE BASE ELECTRODE AND SAID ADDITIONAL ELECTRODE HAVING, TO CURRENT FLOW BETWEEN SAID BASE ELECTRODES, AN ELECTRICAL RESISTANCE INCLUDING THE SPREADING RESISTANCE OF SAID ONE BASE ELECTRODE WHICH, IN THE ABSENCE OF INJECTION OF MINORITY CARRIES INTO SAID BODY FROM SAID ADDITIONAL ELECTRODE, IS GREATER THAN THE ELECTRICAL RESISTANCE OF THAT PORTION OF SAID BODY BETWEEN SAID ADDITIONAL ELECTRODE AND SAID OTHER BASE ELECTRODE.
Claim 2
Dependent Claim
160 words
IN A UNIJUNCTION TRANSISTOR INCLUDING A BODY OF SEMICONDUCTOR MATERIAL OF ONE CONDUCTIVITY TYPE HAVING A PAIR OF BASE ELECTRODES SPACED ON SAID BODY AND MAKING NONRECTIFYING CONTACT THEREWITH; THE IMPROVEMENT WHICH COMPRISES ONE OF SAID BASE ELECTRODES BEING SMALL IN AREAS OF CONTACT IN RELATION TO THE DIMENSIONS OF SAID BODY AND IN RELATION TO THE AREA OF CONTACT OF SAID OTHER BASE ELECTRODE; AND AN ADDITIONAL ELECTRODE MAKING RECITFYING CONTACT WITH SAID BODY AND BEING SPACED CLOSER TO SAID ONE BASE ELECTRODE THAN TO SAID OTHER ELECTRODE; THAT PORTION OF SAID BODY BETWEEN SAID ONE BASE ELECTRODE AND SAID ADDITIONAL ELECTRODE HAVING, TO CURRENT FLOW BETWEEN SAID BASE ELECTRODES, AN ELECTRICAL RESISTANCE INCLUDING THE SPREADING RESISTANCE OF SAID ONE BASE ELECTRODE WHICH, IN THE ABSENCE OF INJECTION OF MINORITY CARRIES INTO SAID BODY FROM SAID ADDITIONAL ELECTRODE, IS GREATER THAN THE ELECTRICAL RESISTANCE OF THAT PORTION OF SAID BODY BETWEEN SAID ADDITIONAL ELECTRODE AND SAID OTHER BASE ELECTRODE.
References Cited (Backward Citations)
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Cited
US2769926A
Cited
US3081421A
Cited
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Cited
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Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |