US3304438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase shift gate drive circuit
Assignee: Sprague Electric Co
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Filing: 1963-11-19
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Granted: 1967-02-14
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Expires: 1983-11-19
Abstract
No abstract record available.
Inventors
- 👤 Nicholas G Muskovac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:27
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
AN ELECTRICAL APPARATUS INCLUDING IN COMBINATION A PHASE SHIFTING MEANS FOR PRODUCING AN OUTPUT VOLTAGE VARIABLE IN PHASE RELATIONSHIP TO AN APPLIED ALTERNATING VOLTAGE AND CONNECTIBLE TO A CONTROLLED RECTIFIER FOR APPLYING A FIRING SIGNAL TO THE RECTIFIER, SAID PHASE SHIFTING MEANS INCLUDING A FIRST BRANCH CIRCUIT CONSISTING OF A PAIR OF IMPEDANCES AND A SECOND BRANCH CIRCUIT INCLUDING A CAPACITOR AND A TRANSISTOR SERIALLY CONNECTED ACROSS A PORTION OF SAID SECOND BRANCH CIRCUIT, A D.C. SIGNAL MEANS FOR VARYING THE RELATIVE CONDUCTANCE OF SAID TRANSISTOR FOR AN OUTPUT TERMINAL OF SAID PHASE SHIFTING MEANS CONNECTED BETWEEN SAID CAPACITOR AND TRANSISTOR, A FIRST UNIDIRECTIONAL CURRENT MEANS CONTROLLING THE CHARGING OF SAID CAPACITOR, A SECOND MEANS FOR PROVIDING A UNIDIRECTIONAL CURRENT, THE EMITTER AND COLLECTOR OF A PAIR OF SECOND TRANSISTORS COUPLED TO SAID SECOND UNIDIRECTIONAL MEANS, A PAIR OF CONTROLLED RECTIFIERS, MEANS CONNECTING SAID EMITTER AND COLLECTOR OF EACH OF SAID SECOND TRANSISTORS TO THE GATE AND CATHODE RESPECTIVELY OF SAID CONTROLLED RECTIFIERS
Claim 2
Dependent Claim
163 words
AN ELECTRICAL APPARATUS INCLUDING IN COMBINATION A PHASE SHIFTING MEANS FOR PRODUCING AN OUTPUT VOLTAGE VARIABLE IN PHASE RELATIONSHIP TO AN APPLIED ALTERNATING VOLTAGE AND CONNECTIBLE TO A CONTROLLED RECTIFIER FOR APPLYING A FIRING SIGNAL TO THE RECTIFIER, SAID PHASE SHIFTING MEANS INCLUDING A FIRST BRANCH CIRCUIT CONSISTING OF A PAIR OF IMPEDANCES AND A SECOND BRANCH CIRCUIT INCLUDING A CAPACITOR AND A TRANSISTOR SERIALLY CONNECTED ACROSS A PORTION OF SAID SECOND BRANCH CIRCUIT, A D.C. SIGNAL MEANS FOR VARYING THE RELATIVE CONDUCTANCE OF SAID TRANSISTOR FOR AN OUTPUT TERMINAL OF SAID PHASE SHIFTING MEANS CONNECTED BETWEEN SAID CAPACITOR AND TRANSISTOR, A FIRST UNIDIRECTIONAL CURRENT MEANS CONTROLLING THE CHARGING OF SAID CAPACITOR, A SECOND MEANS FOR PROVIDING A UNIDIRECTIONAL CURRENT, THE EMITTER AND COLLECTOR OF A PAIR OF SECOND TRANSISTORS COUPLED TO SAID SECOND UNIDIRECTIONAL MEANS, A PAIR OF CONTROLLED RECTIFIERS, MEANS CONNECTING SAID EMITTER AND COLLECTOR OF EACH OF SAID SECOND TRANSISTORS TO THE GATE AND CATHODE RESPECTIVELY OF SAID CONTROLLED RECTIFIERS
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) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |