Patent US3073969A successfully refreshed from Google Patents.
US3073969A
Expired / Lapsed
US
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Transistor switching circuit with stabilized leakage current path
Assignee: Giannini Controls Corp
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Filing: 1960-03-25
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Granted: 1963-01-15
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Expires: 1980-03-25
Abstract
No abstract record available.
Inventors
- 👤 Dawson C Skillen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:11
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/12; H03K17/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
121 words
IN COMBINATION, A POWER TRANSISTOR HAVING A BASE AND HAVING A COLLECTOR AND AN EMITTER CONNECTED IN A LOAD CIRCUIT, SWITCHING CIRCUIT MEANS FOR SELECTIVELY SUPPLYING A CONTROL SIGNAL TO THE BASE OF THE POWER TRANSISTOR TO SHIFT THE SAME BETWEEN CONDUCTIVE AND CUT-OFF CONDITIONS, AN AUXILIARY TRANSISTOR HAVING AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT, SAID OUTPUT CIRCUIT BEING CONNECTED TO THE BASE OF THE POWER TRANSISTOR IN SHUNT TO THE SWITCHING CIRCUIT MEANS IN SUCH POLARITY THAT CURRENT IN THE OUTPUT CIRCUIT TENDS TO PREVENT CONDUCTION IN THE POWER TRANSISTOR, AND A SEMICONDUCTOR DIODE CONNECTED IN THE INPUT CIRCUIT OF THE AUXILIARY TRANSISTOR IN SUCH POLARITY THAT REVERSE CURRENT IN THE DIODE TENDS TO RENDER THE AUXILIARY TRANSISTOR CONDUCTIVE.
References Cited (Backward Citations)
US2892165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |