Patent US3275852A successfully refreshed from Google Patents.
US3275852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor switch
Assignee: International Business Machines Corp
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Filing: 1964-03-18
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Granted: 1966-09-27
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Expires: 1984-03-18
Abstract
No abstract record available.
Inventors
- 👤 Jursik James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:10
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/06; H03K17/10; H03K17/16; H03K17/51; H03K17/56; H03K17/60; H03K17/62; H03K17/6257
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A TRANSISTOR SWITCH COMPRISING: FIRST AND SECOND TRANSISTORS EACH HAVING AN EMITTER ELECTRODE, A BASE ELECTRODE AND A COLLECTOR ELECTRODE; A COMMON COLLECTOR CONNECTION CONECTING THE COLLECTOR ELECTRODE OF SAID TRANSISTORS IN COMMON; A COMMON BASE CONNECTION CONNECTING THE BASE ELECTRODES OF SAID TRANSISTORS IN COMMON; THE EMITTER ELECTRODE OF SAID TRANSISTORS FORMING A PAIR OF SWITCH TERMINALS; AND A CONTROL CIRCUIT CONNECTED BETWEEN SAID COMMON BASE CONNECTION AND SAID COMMON COLLECTOR CONNECTION FOR OPENING AND CLOSING THE PATH BETWEEN SAID SWITCH TERMINALS; THE IMPROVEMENT COMPRISING AT LEAST ONE UNIDIRECTIONAL DEVICE IN SAID COMMON BASE CONNECTION AND MEANS FOR OPEN-CIRCUITING SAID CONTROL CIRCUIT WHEN SAID SWITCH IS IN THE OFF CONDITION; WHEREBY SAID SWITCH CAN SUSTAIN BETWEEN SAID SWITCH TERMINALS WHEN SAID SWITCH IS IN THE OPEN CONDITION A VOLTAGE GREATER THAN THE BASE EMITTER BREAKDOWN VOLTAGE OF SAID TRANSISTORS.
Claim 2
Dependent Claim
140 words
A TRANSISTOR SWITCH COMPRISING: FIRST AND SECOND TRANSISTORS EACH HAVING AN EMITTER ELECTRODE, A BASE ELECTRODE AND A COLLECTOR ELECTRODE; A COMMON COLLECTOR CONNECTION CONECTING THE COLLECTOR ELECTRODE OF SAID TRANSISTORS IN COMMON; A COMMON BASE CONNECTION CONNECTING THE BASE ELECTRODES OF SAID TRANSISTORS IN COMMON; THE EMITTER ELECTRODE OF SAID TRANSISTORS FORMING A PAIR OF SWITCH TERMINALS; AND A CONTROL CIRCUIT CONNECTED BETWEEN SAID COMMON BASE CONNECTION AND SAID COMMON COLLECTOR CONNECTION FOR OPENING AND CLOSING THE PATH BETWEEN SAID SWITCH TERMINALS; THE IMPROVEMENT COMPRISING AT LEAST ONE UNIDIRECTIONAL DEVICE IN SAID COMMON BASE CONNECTION AND MEANS FOR OPEN-CIRCUITING SAID CONTROL CIRCUIT WHEN SAID SWITCH IS IN THE OFF CONDITION; WHEREBY SAID SWITCH CAN SUSTAIN BETWEEN SAID SWITCH TERMINALS WHEN SAID SWITCH IS IN THE OPEN CONDITION A VOLTAGE GREATER THAN THE BASE EMITTER BREAKDOWN VOLTAGE OF SAID TRANSISTORS.
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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |