US3129354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor circuit
Assignee: Westinghouse Electric Corp
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Filing: 1960-08-12
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Granted: 1964-04-14
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Expires: 1980-08-12
Abstract
No abstract record available.
Inventors
- 👤 Melbourne J Hellstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:16
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/62; H03K4/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A CONTROLLABLE SWITCHING CIRCUIT COMPRISING IN COMBINATION A TRANSISTOR INCLUDING BASE EMITTER AND COLLECTOR ELECTRODES, WITH THE BASE-EMITTER JUNCTION THEREOF EXHIBITING STORAGE OF MINORITY CARRIER CHARGE WHEN FORWARDLY BIASED AND REQUIRING REMOVAL OF SAID CHARGE AS A PRECEDENT TO TURNING OFF THE COLLECTOR CURRENT, AN ASYMMETRICALLY CONDUCTING DIODE CONNECTED IN SERIES WITH AND POLED IN THE SAME DIRECTION AS SAID JUNCTION TO NORMALLY PROVIDE A LOW RESISTANCE PATH FOR BASE EMITTER CURRENT, CONTROL SIGNAL INPUT MEANS CONNECTED ACROSS THE SERIES COMBINATION OF SAID JUNCTION AND SAID DIODE FOR PERIODICALLY PROVIDING REVERSE BIASING VOLTAGE PULSES HAVING AMPLITUDES EXCEEDING THE REVERSE BREAKDOWN VOLTAGE OF SAID JUNCTION, AND SAID DIODE HAVING A MINORITY CARRIER RECOVERY TIME OF THE SAME ORDER OF MAGNITUDE AS THE MINORITY CARRIER RECOVERY TIME OF SAID BASE-EMITTER JUNCTION.
Claim 2
Dependent Claim
129 words
A CONTROLLABLE SWITCHING CIRCUIT COMPRISING IN COMBINATION A TRANSISTOR INCLUDING BASE EMITTER AND COLLECTOR ELECTRODES, WITH THE BASE-EMITTER JUNCTION THEREOF EXHIBITING STORAGE OF MINORITY CARRIER CHARGE WHEN FORWARDLY BIASED AND REQUIRING REMOVAL OF SAID CHARGE AS A PRECEDENT TO TURNING OFF THE COLLECTOR CURRENT, AN ASYMMETRICALLY CONDUCTING DIODE CONNECTED IN SERIES WITH AND POLED IN THE SAME DIRECTION AS SAID JUNCTION TO NORMALLY PROVIDE A LOW RESISTANCE PATH FOR BASE EMITTER CURRENT, CONTROL SIGNAL INPUT MEANS CONNECTED ACROSS THE SERIES COMBINATION OF SAID JUNCTION AND SAID DIODE FOR PERIODICALLY PROVIDING REVERSE BIASING VOLTAGE PULSES HAVING AMPLITUDES EXCEEDING THE REVERSE BREAKDOWN VOLTAGE OF SAID JUNCTION, AND SAID DIODE HAVING A MINORITY CARRIER RECOVERY TIME OF THE SAME ORDER OF MAGNITUDE AS THE MINORITY CARRIER RECOVERY TIME OF SAID BASE-EMITTER JUNCTION.
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) | 1967-04-14 | 1967-10-14 | 1968-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-14 | 1971-10-14 | 1972-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-14 | 1975-10-14 | 1976-04-14 | $7700.00 | Window Closed / Lapsed |