Patent US3210677A successfully refreshed from Google Patents.
US3210677A
Expired / Lapsed
US
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Unipolar-bipolar semiconductor amplifier
Assignee: Westinghouse Electric Corp
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Filing: 1962-05-28
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Granted: 1965-10-05
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Expires: 1982-05-28
Abstract
No abstract record available.
Inventors
- 👤 Lin Hung Chang
- 👤 Yu Karl Ka-Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:51
CPC Classifications
H; H10; H10D; H10D88/00; H03; H03F; H03F3/00; H03F3/181; H03F3/183; H03F3/185; H03F3/1855; H03F3/34; H03F3/343; H03F3/3432; H03F3/3435; H10D84/00; H10D84/40; H10D84/401; H10D84/403; Y; Y10; Y10S; Y10S148/00; Y10S148/049; Y10S148/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN AN OPERATING CIRCUIT OF A BIPOLAR TRANSISTOR AMPLIFIER, THE COMBINATION COMPRISING BIPOLAR TRANSISTOR MEANS HAVING A BASE, A COLLECTOR AND AN EMITTER; AND MEANS TO BIAS SAID BIPOLAR TRANSISTOR MEANS AND TO PROVIDE A HIGH INPUT IMPEDANCE INCLUDING FIRST AND SECOND UNIPOLAR TRANSISTOR MEANS, SAID FIRST UNIPOLAR TRANSISTOR MEANS ELECTRICALLY COUPLED BETWEEN SAID BASE AND SAID COLLECTOR AND SAID SECOND UNIPOLAR TRANSISTOR MEANS ELECTRICALLY COUPLED BETWEEN SAID BASE AND SAID EMITTER; EACH OF SAID UNIPOLAR TRANSISTOR MEANS HAVING A GATE, A SOURCE AND A DRAIN, INPUT CONTACT MEANS FOR APPLYING AN INPUT SIGNAL TO
Claim 2
Dependent Claim
95 words
IN AN OPERATING CIRCUIT OF A BIPOLAR TRANSISTOR AMPLIFIER, THE COMBINATION COMPRISING BIPOLAR TRANSISTOR MEANS HAVING A BASE, A COLLECTOR AND AN EMITTER; AND MEANS TO BIAS SAID BIPOLAR TRANSISTOR MEANS AND TO PROVIDE A HIGH INPUT IMPEDANCE INCLUDING FIRST AND SECOND UNIPOLAR TRANSISTOR MEANS, SAID FIRST UNIPOLAR TRANSISTOR MEANS ELECTRICALLY COUPLED BETWEEN SAID BASE AND SAID COLLECTOR AND SAID SECOND UNIPOLAR TRANSISTOR MEANS ELECTRICALLY COUPLED BETWEEN SAID BASE AND SAID EMITTER; EACH OF SAID UNIPOLAR TRANSISTOR MEANS HAVING A GATE, A SOURCE AND A DRAIN, INPUT CONTACT MEANS FOR APPLYING AN INPUT SIGNAL TO
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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |