US3309527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chopper amplifier
Assignee: Westinghouse Electric Corp
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Filing: 1963-02-21
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Granted: 1967-03-14
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Expires: 1983-02-21
Abstract
No abstract record available.
Inventors
- 👤 Alec H B Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:25
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; H03F3/387; H03F3/20; H03F3/21; H03F3/217
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A CHOPPER AMPLIFIER COMPRISING, AT LEAST ONE CONTROLLABLE RECTIFIER DEVICE EACH HAVING ANODE, CATHODE AND CONTROL ELECTRODES WITH BOTH TURN-ON AND TURN-OFF CONTROL CHARACTERISTICS, INPUT TERMINALS, OUTPUT TERMINALS, A SOURCE OF ANODE VOLTAGE CONNECTED IN SERIES WITH SAID ANODE AND CATHODE ELECTRODES, A SOURCE OF BIAS VOLTAGE CONNECTED IN SERIES WITH SAID CONTROL AND CATHODE ELECTRODES, A RESISTANCE CONNECTED IN BOTH THE ANODE-CATHODE AND CONTROLCATHODE CIRCUITS, REACTANCE MEANS CONNECTED IN THE CONTROLCATHODE CIRCUIT TO DELAY BOTH THE FLOW OF TURN-OFF CURRENT GENERATED BY SAID RESISTANCE AND THE FLOW OF TURN-ON CURRENT FROM SAID BIAS SOURCE AND HENCE PREDETERMINE THE CHOPPING FREQUENCY AND DUTY CYCLE OF THE CONDUCTIVE AND NON-CONDUCTIVE STATES OF SAID DEVICE, MEANS TO COUPLE A SIGNAL TO BE AMPLIFIED FROM SAID INPUT TERMINALS IN SERIES WITH THE BIAS SOURCE IN THE CONTROL-CATHODE CIRCUIT OF SAID DEVICE, AND MEANS TO COUPLE THE AMPLIFIED OUTPUT SIGNAL IN SAID ANODE CIRCUIT TO SAID OUTPUT TERMINALS.
Claim 2
Dependent Claim
154 words
A CHOPPER AMPLIFIER COMPRISING, AT LEAST ONE CONTROLLABLE RECTIFIER DEVICE EACH HAVING ANODE, CATHODE AND CONTROL ELECTRODES WITH BOTH TURN-ON AND TURN-OFF CONTROL CHARACTERISTICS, INPUT TERMINALS, OUTPUT TERMINALS, A SOURCE OF ANODE VOLTAGE CONNECTED IN SERIES WITH SAID ANODE AND CATHODE ELECTRODES, A SOURCE OF BIAS VOLTAGE CONNECTED IN SERIES WITH SAID CONTROL AND CATHODE ELECTRODES, A RESISTANCE CONNECTED IN BOTH THE ANODE-CATHODE AND CONTROLCATHODE CIRCUITS, REACTANCE MEANS CONNECTED IN THE CONTROLCATHODE CIRCUIT TO DELAY BOTH THE FLOW OF TURN-OFF CURRENT GENERATED BY SAID RESISTANCE AND THE FLOW OF TURN-ON CURRENT FROM SAID BIAS SOURCE AND HENCE PREDETERMINE THE CHOPPING FREQUENCY AND DUTY CYCLE OF THE CONDUCTIVE AND NON-CONDUCTIVE STATES OF SAID DEVICE, MEANS TO COUPLE A SIGNAL TO BE AMPLIFIED FROM SAID INPUT TERMINALS IN SERIES WITH THE BIAS SOURCE IN THE CONTROL-CATHODE CIRCUIT OF SAID DEVICE, AND MEANS TO COUPLE THE AMPLIFIED OUTPUT SIGNAL IN SAID ANODE CIRCUIT TO SAID OUTPUT TERMINALS.
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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |