Patent US3200167A successfully refreshed from Google Patents.
Patent US3194979A successfully refreshed from Google Patents.
US3194979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor switching circuit
Assignee: AT&T Inc
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Filing: 1961-09-29
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Granted: 1965-07-13
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Expires: 1981-09-29
Abstract
No abstract record available.
Inventors
- 👤 Wing N Toy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:57
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
190 words
A TRANSISTOR SWITCHING CIRCUIT COMPRISING, IN COMBINATION, A FIRST TRANSISTOR OF A GIVEN CONDUCTIVITY TYPE HAVING A BASE ELECTRODE, AN EMITTER ELECTRODE, AND A COLLECTOR ELECTRODE, A SOURCE OF COLLECTOR VOLTAGE, A BIASING RESISTOR CONNECTING SAID SOURCE OF COLLECTOR VOLTAGE TO SAID COLLECTOR ELECTRODE OF SAID FIRST TRANSISTOR, MEANS CONNECTING SAID EMITTER ELECTRODE OF SAID FIRST TRANSISTOR TO GROUND POTENTIAL, MEANS CONNECTING A SOURCE OF SUBSTANTIALLY RECTANGULAR PULSES BETWEEN SAID BASE AND SAID EMITTER ELECTRODES OF SAID FIRST TRANSISTOR, THE AMPLITUDE OF SAID PULSES APPLIED BETWEEN SAID BASE AND EMITTER ELECTRODES OF SAID FIRST TRANSISTOR BEING SUFFICIENT TO DRIVE SAID TRANSISTOR INTO A CONDITION OF COLLECTOR CURRENT SATURATION IN WHICH MINORITY CARRIERS ARE STORED, MEANS TO REDUCE THE MINORITY CARRIER STORAGE TIME IN SAID FIRST TRANSISTOR COMPRISING A SECOND TRANSISTOR OF THE SAME CONDUCTIVITY TYPE AS SAID FIRST TRANSISTOR HAVING A BASE ELECTRODE, AN EMITTER ELECTRODE, AND A COLLECTOR ELECTRODE, MEANS CONNECTING SAID SOURCE OF SUBSTANTIALLY RECTANGULAR PULSES BETWEEN SAID BASE AND SAID EMITTER ELECTRODES OF SAID SECOND TRANSISTOR SO THAT SAID SECOND TRANSISTOR CONDUCTS UPON THE TERMINATION OF A PULSE FROM SAID SOURCE OF PULSES, MEANS CONNECTING THE COLLECTOR
Claim 2
Dependent Claim
190 words
A TRANSISTOR SWITCHING CIRCUIT COMPRISING, IN COMBINATION, A FIRST TRANSISTOR OF A GIVEN CONDUCTIVITY TYPE HAVING A BASE ELECTRODE, AN EMITTER ELECTRODE, AND A COLLECTOR ELECTRODE, A SOURCE OF COLLECTOR VOLTAGE, A BIASING RESISTOR CONNECTING SAID SOURCE OF COLLECTOR VOLTAGE TO SAID COLLECTOR ELECTRODE OF SAID FIRST TRANSISTOR, MEANS CONNECTING SAID EMITTER ELECTRODE OF SAID FIRST TRANSISTOR TO GROUND POTENTIAL, MEANS CONNECTING A SOURCE OF SUBSTANTIALLY RECTANGULAR PULSES BETWEEN SAID BASE AND SAID EMITTER ELECTRODES OF SAID FIRST TRANSISTOR, THE AMPLITUDE OF SAID PULSES APPLIED BETWEEN SAID BASE AND EMITTER ELECTRODES OF SAID FIRST TRANSISTOR BEING SUFFICIENT TO DRIVE SAID TRANSISTOR INTO A CONDITION OF COLLECTOR CURRENT SATURATION IN WHICH MINORITY CARRIERS ARE STORED, MEANS TO REDUCE THE MINORITY CARRIER STORAGE TIME IN SAID FIRST TRANSISTOR COMPRISING A SECOND TRANSISTOR OF THE SAME CONDUCTIVITY TYPE AS SAID FIRST TRANSISTOR HAVING A BASE ELECTRODE, AN EMITTER ELECTRODE, AND A COLLECTOR ELECTRODE, MEANS CONNECTING SAID SOURCE OF SUBSTANTIALLY RECTANGULAR PULSES BETWEEN SAID BASE AND SAID EMITTER ELECTRODES OF SAID SECOND TRANSISTOR SO THAT SAID SECOND TRANSISTOR CONDUCTS UPON THE TERMINATION OF A PULSE FROM SAID SOURCE OF PULSES, MEANS CONNECTING THE COLLECTOR
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) | 1968-07-12 | 1969-01-11 | 1969-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-12 | 1973-01-11 | 1973-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-12 | 1977-01-11 | 1977-07-13 | $7700.00 | Window Closed / Lapsed |