Patent US3128440A successfully refreshed from Google Patents.
US3128440A
Expired / Lapsed
US
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Electrical apparatus for controlling current and voltage
Assignee: Individual
•
Filing: 1959-05-28
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Granted: 1964-04-07
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Expires: 1979-05-28
Abstract
No abstract record available.
Inventors
- 👤 Ariel R Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:21
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/445; G05F1/32; G05F1/34; G05F1/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
ELECTRICAL CONTROL APPARATUS FOR CONTROLLING THE VOLTAGE APPLIED TO A LOAD COMPRISING A CONTROL TRANSFORMER HAVING A SINGLE LOAD CURRENT CARRYING WINDING FOR CONNECTING IN SERIES WITH A LOAD FOR PASSING BOTH HALVES OF THE ALTERNATING CURRENT AND VARIABLE IN IMPEDANCE TO VARY THE APPLIED VOLTAGE OVER A WIDE RANGE AND HAVING A CONTROL WINDING FOR VARYING THE IMPEDANCE OF SAID LOAD CURRENT CARRYING WINDING BY REDUCING THE IMPEDANCE, SAID CONTROL TRANSFORMER STORING ENERGY ON PASSAGE OF LOAD CURRENT TO MAINTAIN THE IMPEDANCE OF THE LOAD CURRENT CARRYING WINDING ON THE SUCCEEDING HALF CYCLE AT SUBSTANTIALLY THE SAME VALUE, A SILICON CONTROLLED RECTIFIER IN SERIES WITH SAID CONTROL WINDING FOR CONTROLLING THE AMOUNT OF CURRENT THERETHROUGH BY VARIATION OF THE PHASE RELATION
Claim 2
Dependent Claim
122 words
ELECTRICAL CONTROL APPARATUS FOR CONTROLLING THE VOLTAGE APPLIED TO A LOAD COMPRISING A CONTROL TRANSFORMER HAVING A SINGLE LOAD CURRENT CARRYING WINDING FOR CONNECTING IN SERIES WITH A LOAD FOR PASSING BOTH HALVES OF THE ALTERNATING CURRENT AND VARIABLE IN IMPEDANCE TO VARY THE APPLIED VOLTAGE OVER A WIDE RANGE AND HAVING A CONTROL WINDING FOR VARYING THE IMPEDANCE OF SAID LOAD CURRENT CARRYING WINDING BY REDUCING THE IMPEDANCE, SAID CONTROL TRANSFORMER STORING ENERGY ON PASSAGE OF LOAD CURRENT TO MAINTAIN THE IMPEDANCE OF THE LOAD CURRENT CARRYING WINDING ON THE SUCCEEDING HALF CYCLE AT SUBSTANTIALLY THE SAME VALUE, A SILICON CONTROLLED RECTIFIER IN SERIES WITH SAID CONTROL WINDING FOR CONTROLLING THE AMOUNT OF CURRENT THERETHROUGH BY VARIATION OF THE PHASE RELATION
References Cited (Backward Citations)
US2154020A
Cited
US2444472A
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US2625676A
Cited
US2666887A
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US2757331A
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US2728887A
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US2740086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |