US3172960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Symmetrical transistor amplifier
Assignee: Nokia Bell Labs
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Filing: 1961-12-12
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Granted: 1965-03-09
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Expires: 1981-12-12
Abstract
No abstract record available.
Inventors
- 👤 Kennard Everett Voyles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:35
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/181; H03F3/183; H04; H04M; H04M1/00; H04M1/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A TRANSISTOR AMPLIFIER OPERABLE FROM A VOLTAGE SOURCE OF REVERSIBLE POLARITY COMPRISING A SYMMETRICAL TRANSISTOR HAVING A NOMINAL COLLECTOR, A NOMINAL EMITTER AND A BASE, TRANSDUCER MEANS HAVING FIRST AND SECOND COIL WINDINGS WHICH ARE SUBSTANTIALLY IDENTICAL, MEANS CONNECTING SAID FIRST WINDING BETWEEN ONE TERMINAL OF SAID SOURCE AND THE NOMINAL COLLECTOR OF SAID TRANSISTOR, MEANS CONNECTING SAID SECOND WINDING BETWEEN THE OTHER TERMINAL OF SAID SOURCE AND THE NOMINAL EMITTER OF SAID TRANSISTOR, RESISTOR MEANS CONNECTING THE BASE OF SAID TRANSISTOR TO EACH OF THE TERMINALS OF SAID SOURCE, AND MEANS FOR COUPLING THE SIGNAL TO BE AMPLIFIED TO SAID BASE, WHEREBY SAID CIRCUIT IS OPERATIVE TO AMPLIFY THE APPLIED SIGNAL IRRESPECTIVE OF THE POLARITY OF THE VOLTAGE SOURCE.
Claim 2
Dependent Claim
120 words
A TRANSISTOR AMPLIFIER OPERABLE FROM A VOLTAGE SOURCE OF REVERSIBLE POLARITY COMPRISING A SYMMETRICAL TRANSISTOR HAVING A NOMINAL COLLECTOR, A NOMINAL EMITTER AND A BASE, TRANSDUCER MEANS HAVING FIRST AND SECOND COIL WINDINGS WHICH ARE SUBSTANTIALLY IDENTICAL, MEANS CONNECTING SAID FIRST WINDING BETWEEN ONE TERMINAL OF SAID SOURCE AND THE NOMINAL COLLECTOR OF SAID TRANSISTOR, MEANS CONNECTING SAID SECOND WINDING BETWEEN THE OTHER TERMINAL OF SAID SOURCE AND THE NOMINAL EMITTER OF SAID TRANSISTOR, RESISTOR MEANS CONNECTING THE BASE OF SAID TRANSISTOR TO EACH OF THE TERMINALS OF SAID SOURCE, AND MEANS FOR COUPLING THE SIGNAL TO BE AMPLIFIED TO SAID BASE, WHEREBY SAID CIRCUIT IS OPERATIVE TO AMPLIFY THE APPLIED SIGNAL IRRESPECTIVE OF THE POLARITY OF THE VOLTAGE SOURCE.
References Cited (Backward Citations)
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Cited
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US2785231A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |