Patent US2031018A successfully refreshed from Google Patents.
US2709780A
Expired / Lapsed
US
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Constant voltage semiconductor devices
Assignee: AT&T Inc
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Filing: 1952-10-11
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Granted: 1955-05-31
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Expires: 1972-10-11
Abstract
No abstract record available.
Inventors
- 👤 Reymond J Kircher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:46
CPC Classifications
H; H10; H10D; H10D99/00; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/392
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A CONSTANT VOLTAGE DEVICE COMPRISING A BODY OF SEMICONDUCTIVE MATERIAL HAVING A PAIR OF OPPOSED FACES, SAID BODY HAVING THEREIN AND EXTENDING FROM ONE OF SAID FACES INTO PROXIMITY TO THE OTHER OF SAID FACES, A ZONE OF DIFFERENT CONDUCTIVITY THAN THE BULK OF SAID BODY, A SUBSTANTIALLY OHMIC BASE CONNECTION TO SAID OTHER FACE, A COLLECTOR CONNECTION TO SAID ZONE, AN EMITTER CONNECTION TO SAID BODY IN PROXIMITY TO SAID ZONE BUT OUTSIDE THEREOF, MEANS BIASING SAID COLLECTOR CONNECTION IN THE REVERSE DIRECTION RELATIVE TO SAID BASE CONNECTION, AND MEANS FOR MAINTAINING THE COLLECTOR TO BASE VOLTAGE SUBSTANTIALLY CONSTANT AT A PRESCRIBED VALUE COMPRISING MEANS BIASING SAID EMITTER CONNECTION IN THE REVERSE DIRECTION RELATIVE TO SAID BASE CONNECTION.
Claim 2
Dependent Claim
119 words
A CONSTANT VOLTAGE DEVICE COMPRISING A BODY OF SEMICONDUCTIVE MATERIAL HAVING A PAIR OF OPPOSED FACES, SAID BODY HAVING THEREIN AND EXTENDING FROM ONE OF SAID FACES INTO PROXIMITY TO THE OTHER OF SAID FACES, A ZONE OF DIFFERENT CONDUCTIVITY THAN THE BULK OF SAID BODY, A SUBSTANTIALLY OHMIC BASE CONNECTION TO SAID OTHER FACE, A COLLECTOR CONNECTION TO SAID ZONE, AN EMITTER CONNECTION TO SAID BODY IN PROXIMITY TO SAID ZONE BUT OUTSIDE THEREOF, MEANS BIASING SAID COLLECTOR CONNECTION IN THE REVERSE DIRECTION RELATIVE TO SAID BASE CONNECTION, AND MEANS FOR MAINTAINING THE COLLECTOR TO BASE VOLTAGE SUBSTANTIALLY CONSTANT AT A PRESCRIBED VALUE COMPRISING MEANS BIASING SAID EMITTER CONNECTION IN THE REVERSE DIRECTION RELATIVE TO SAID BASE CONNECTION.
References Cited (Backward Citations)
FR929898A
Cited
US2629833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |