Patent US4280220A successfully refreshed from Google Patents.
Patent US3204172A successfully refreshed from Google Patents.
US3204172A
Expired / Lapsed
US
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Semiconductor controlled rectifier circuits
Assignee: Harrel Inc
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Filing: 1959-12-14
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Granted: 1965-08-31
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Expires: 1979-12-14
Abstract
No abstract record available.
Inventors
- 👤 Horace E Darling
- 👤 Holton E Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:39
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/1555; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/125; H02M3/135; H02M3/137
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
SEMICONDUCTOR CONTROLLED RECTIFIER CIRCUITS COMPRISING A FULL WAVE RECTIFIER INCLUDING INPUT AND OUTPUT CIRCUITS, A SEMICONDUCTOR CONTROLLED RECTIFIER INCLUDING AN ANODE, A CATHODE AND A GATE, MEANS CONNECTING THE ANODE AND CATHODE OF THE CONTROLLED RECTIFIER IN SERIES IN THE FULL WAVE RECTIFIER OUTPUT CIRCUIT, OUTPUT TERMINALS IN SERIES IN THE FULL WAVE RECTIFIER OUTPUT CIRCUIT ADAPTED TO BE CONNECTED TO A LOAD, MEANS TO SUPPLY TIMED CURRENT PULSES TO THE CONTROLLED RECTIFIER GATE TO INITIATE CONDUCTION OF THE CONTROLLED RECTIFIER, MEANS RESPONSIVE TO CONDUCTION OF THE CONTROLLED RECTIFIER TO CUT OFF THE CURRENT PULSE THAT INITIATED SAID CONDUCTION, AND MEANS TO REDUCE CURRENT FLOW THROUGH THE CONTROLLED RECTIFIER SUBSTANTIALLY TO ZERO AT THE END OF EACH HALF CYCLE OF OPERATION.
Claim 2
Dependent Claim
121 words
SEMICONDUCTOR CONTROLLED RECTIFIER CIRCUITS COMPRISING A FULL WAVE RECTIFIER INCLUDING INPUT AND OUTPUT CIRCUITS, A SEMICONDUCTOR CONTROLLED RECTIFIER INCLUDING AN ANODE, A CATHODE AND A GATE, MEANS CONNECTING THE ANODE AND CATHODE OF THE CONTROLLED RECTIFIER IN SERIES IN THE FULL WAVE RECTIFIER OUTPUT CIRCUIT, OUTPUT TERMINALS IN SERIES IN THE FULL WAVE RECTIFIER OUTPUT CIRCUIT ADAPTED TO BE CONNECTED TO A LOAD, MEANS TO SUPPLY TIMED CURRENT PULSES TO THE CONTROLLED RECTIFIER GATE TO INITIATE CONDUCTION OF THE CONTROLLED RECTIFIER, MEANS RESPONSIVE TO CONDUCTION OF THE CONTROLLED RECTIFIER TO CUT OFF THE CURRENT PULSE THAT INITIATED SAID CONDUCTION, AND MEANS TO REDUCE CURRENT FLOW THROUGH THE CONTROLLED RECTIFIER SUBSTANTIALLY TO ZERO AT THE END OF EACH HALF CYCLE OF OPERATION.
References Cited (Backward Citations)
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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) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |