US3223933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-ended push-pull distortionless power amplifier including d.c. feedback
Assignee: Hazeltine Research Inc
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Filing: 1962-12-21
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Granted: 1965-12-14
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Expires: 1982-12-21
Abstract
No abstract record available.
Inventors
- 👤 Fond Norman R La
- 👤 Carl R Wilhelmsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:28
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3083; H03F3/3086; H03F3/3096
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
TRANSISTOR POWER AMPLIFIER APPARATUS COMPRISING: MEANS FOR SUPPLYING AN INPUT SIGNAL; TRANSISTOR CIRCUIT MEANS COUPLED TO SAID SIGNAL SUPPLY MEANS FOR DERIVING SIGNALS OF LIKE AND UNLIKE POLARITY FROM SAID INPUT SIGNALS AND HAVING A PLURALITY OF OUTPUT IMPEDANCES ACROSS WHICH SAID DERIVED SIGNALS ARE DEVELOPED; TRANSISTOR AMPLIFIER COUPLING MEANS COUPLED TO SAID TRANSISTOR CIRCUIT MEANS AND BEING RESPONSIVE TO SAID DERIVED SIGNALS FOR PROVIDING INCREASED DRIVE TO SAID LIKE AND UNLIKE POLARITY SIGNALS; AMPLIFIER MEANS COUPLED TO SAID TRANSISTOR AMPLIFIER COUPLIGN MEANS INCLUDING AT LEAST A PAIR OF TRANSISTOR AMPLIFIER CIRCUITS AND A LOAD IMPEDANCE, EACH OF SAID TRANSISTOR AMPLIFIER CIRCUITS BEING RESPONSIVE TO ONE OF SAID INCREASED DRIVE SIGNALS AND HAVING THEIR RESPONSIVE OUTPUT TERMINALS CONNECTED TO THE SAME END OF SAID LOAD IMPEDANCE IN A SINGLE-ENDED FASHION FOR PROVIDING A PUSH-PULL AMPLIFIER OUTPUT SIGNAL; AND MEANS FOR DIREC-CURRENT COUPLING SAID PUSH-PULL OUTPUT SIGNAL TO SAID DERIVING MEANS IN A BOOTSTRAP MANNER FOR PROVIDING EQUAL, DISTROTION-FREE AMPLIFICATION FROM EACH OF SAID TRANSISTOR AMPLIFIER CIRCUITS OVER A RANGE OF FREQUENCIES EXTENDING FROM EARLY D.-C. TO BEYOND THE AUDIO RANGE.
Claim 2
Dependent Claim
180 words
TRANSISTOR POWER AMPLIFIER APPARATUS COMPRISING: MEANS FOR SUPPLYING AN INPUT SIGNAL; TRANSISTOR CIRCUIT MEANS COUPLED TO SAID SIGNAL SUPPLY MEANS FOR DERIVING SIGNALS OF LIKE AND UNLIKE POLARITY FROM SAID INPUT SIGNALS AND HAVING A PLURALITY OF OUTPUT IMPEDANCES ACROSS WHICH SAID DERIVED SIGNALS ARE DEVELOPED; TRANSISTOR AMPLIFIER COUPLING MEANS COUPLED TO SAID TRANSISTOR CIRCUIT MEANS AND BEING RESPONSIVE TO SAID DERIVED SIGNALS FOR PROVIDING INCREASED DRIVE TO SAID LIKE AND UNLIKE POLARITY SIGNALS; AMPLIFIER MEANS COUPLED TO SAID TRANSISTOR AMPLIFIER COUPLIGN MEANS INCLUDING AT LEAST A PAIR OF TRANSISTOR AMPLIFIER CIRCUITS AND A LOAD IMPEDANCE, EACH OF SAID TRANSISTOR AMPLIFIER CIRCUITS BEING RESPONSIVE TO ONE OF SAID INCREASED DRIVE SIGNALS AND HAVING THEIR RESPONSIVE OUTPUT TERMINALS CONNECTED TO THE SAME END OF SAID LOAD IMPEDANCE IN A SINGLE-ENDED FASHION FOR PROVIDING A PUSH-PULL AMPLIFIER OUTPUT SIGNAL; AND MEANS FOR DIREC-CURRENT COUPLING SAID PUSH-PULL OUTPUT SIGNAL TO SAID DERIVING MEANS IN A BOOTSTRAP MANNER FOR PROVIDING EQUAL, DISTROTION-FREE AMPLIFICATION FROM EACH OF SAID TRANSISTOR AMPLIFIER CIRCUITS OVER A RANGE OF FREQUENCIES EXTENDING FROM EARLY D.-C. TO BEYOND THE AUDIO RANGE.
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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |