Patent US3223852A successfully refreshed from Google Patents.
US3223852A
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Switching circuits
Assignee: ZF International UK Ltd
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Filing: 1962-09-10
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Granted: 1965-12-14
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Expires: 1982-09-10
Abstract
No abstract record available.
Inventors
- 👤 Wright Maurice James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:50
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/73; H03K3/00; H03K3/02; H03K3/35; H03K3/352; H03K3/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A SWITCHING CIRCUIT COMPRISING IN COMBINATION SWITCHABLE RECTIFIER ADAPTED FOR CONNECTING TO A D.C. SOURCE, SAID SWITCHABLE RECTIFIER HAVING AN ANODE, A CATHODE AND A GATE AND BEING SWITCHED ON BY A PREDETERMINED POSITIVE GATE-CATHODE CURRENT AND SWITCHED OFF BY A PREDETERMINED NEGATIVE GATE-CARHODE CURRENT, A LOAD IN THE ANODE CIRCUIT OF THE SWITCHABLE RECTIFIER, A FREERUNNING OSCILLATOR INCLUDING A CAPACITOR IN SERIES WITH THE GATE AND CATHODE OF THE SWITCHABLE RECTIFIER, SAID CAPACITOR BEING ALTERNATELY CHARGED AND DISCHARGED IN USE AND THE DISCHARGE CURRENT SERVING TO SWITCH OFF THE SWITCHABLE RECTIFIER IF THE LATTER IS CONDUCTIVE, AND VARIABLE RESISTANCE MEANS CONNECTED IN CIRCUIT WITH SAID CAPACITOR AND SAID SWITCHABLE RECTIFIER FOR DETERMINING WHETHER OR NOT THE SWITCHABLE RECTIFIER IS SWITCHED ON DURING CHARGING OF THE CAPACITOR.
Claim 2
Dependent Claim
127 words
A SWITCHING CIRCUIT COMPRISING IN COMBINATION SWITCHABLE RECTIFIER ADAPTED FOR CONNECTING TO A D.C. SOURCE, SAID SWITCHABLE RECTIFIER HAVING AN ANODE, A CATHODE AND A GATE AND BEING SWITCHED ON BY A PREDETERMINED POSITIVE GATE-CATHODE CURRENT AND SWITCHED OFF BY A PREDETERMINED NEGATIVE GATE-CARHODE CURRENT, A LOAD IN THE ANODE CIRCUIT OF THE SWITCHABLE RECTIFIER, A FREERUNNING OSCILLATOR INCLUDING A CAPACITOR IN SERIES WITH THE GATE AND CATHODE OF THE SWITCHABLE RECTIFIER, SAID CAPACITOR BEING ALTERNATELY CHARGED AND DISCHARGED IN USE AND THE DISCHARGE CURRENT SERVING TO SWITCH OFF THE SWITCHABLE RECTIFIER IF THE LATTER IS CONDUCTIVE, AND VARIABLE RESISTANCE MEANS CONNECTED IN CIRCUIT WITH SAID CAPACITOR AND SAID SWITCHABLE RECTIFIER FOR DETERMINING WHETHER OR NOT THE SWITCHABLE RECTIFIER IS SWITCHED ON DURING CHARGING OF THE CAPACITOR.
References Cited (Backward Citations)
US3001138A
Cited
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 |