Patent US3271587A successfully refreshed from Google Patents.
US3271587A
Expired / Lapsed
US
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Four-terminal semiconductor switch circuit
Assignee: Texas Instruments Inc
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Filing: 1962-11-13
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Granted: 1966-09-06
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Expires: 1982-11-13
Abstract
No abstract record available.
Inventors
- 👤 Max P Schreiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:05
CPC Classifications
H; H10; H10D; H10D64/00; H10D64/20; H10D64/27; H10D64/291; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H10D18/00; H10D18/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A SEMICONDUCTOR SWITCHING CIRCUIT WHICH COMPRISES: (A) A FOUR-LAYER NEGATIVE RESISTANCE DEVICE HAVING AN ANODE, CATHODE AND MULTIPLE BASE CONTROL TERMINALS, AND NORMALLY CAPABLE OF BEING TURNED OFF ONLY BY A CONTROL PULSE OF MAGNITUDE SUBSTANTIALLY EXCEEDING THE MAGNITUDE OF A TURN-ON PULSE, (B) A CURRENT SOURCE AND A LOAD CONNECTED IN SERIES WITH THE ANODE AND CATHODE TERMINALS OF SAID DEVICE, (C) MEANS CONNECTED BETWEEN SAID CATHODE AND ONE OF SAID BASE CONTROL TERMINALS TO APPLY A BIAS FUNCTION TO MODIFY THE SWITCHING CHARACTER OF SAID DEVICE, AND (D) MEANS TO APPLY TURN-ON AND TURN-OFF PULSES TO AT LEAST ONE OF SAID BASE CONTROL TERMINALS, THE RELATIVE MAGNITUDES OF WHICH ARE DEPENDENT UPON THE MAGNITUDE AND POLARITY OF SAID BIAS FUNCTION.
Claim 2
Dependent Claim
122 words
A SEMICONDUCTOR SWITCHING CIRCUIT WHICH COMPRISES: (A) A FOUR-LAYER NEGATIVE RESISTANCE DEVICE HAVING AN ANODE, CATHODE AND MULTIPLE BASE CONTROL TERMINALS, AND NORMALLY CAPABLE OF BEING TURNED OFF ONLY BY A CONTROL PULSE OF MAGNITUDE SUBSTANTIALLY EXCEEDING THE MAGNITUDE OF A TURN-ON PULSE, (B) A CURRENT SOURCE AND A LOAD CONNECTED IN SERIES WITH THE ANODE AND CATHODE TERMINALS OF SAID DEVICE, (C) MEANS CONNECTED BETWEEN SAID CATHODE AND ONE OF SAID BASE CONTROL TERMINALS TO APPLY A BIAS FUNCTION TO MODIFY THE SWITCHING CHARACTER OF SAID DEVICE, AND (D) MEANS TO APPLY TURN-ON AND TURN-OFF PULSES TO AT LEAST ONE OF SAID BASE CONTROL TERMINALS, THE RELATIVE MAGNITUDES OF WHICH ARE DEPENDENT UPON THE MAGNITUDE AND POLARITY OF SAID BIAS FUNCTION.
References Cited (Backward Citations)
US3097335A
Cited
US3210563A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |