Patent US3334290A successfully refreshed from Google Patents.
US3334290A
Expired / Lapsed
US
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Inverter circuit
Assignee: EIDP Inc
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Filing: 1964-04-01
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Granted: 1967-08-01
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Expires: 1984-04-01
Abstract
No abstract record available.
Inventors
- 👤 Landis James Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:04
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/521
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
117 words
AN IMPROVED INVERTER CIRCUIT FOR SUPPLYING HIGH FREQUENCY A.C. POWER TO A HIGHLY INDUCTIVE LOAD, SAID CIRCUIT COMPRISING, IN COMBINATION: TWO PRIMARY SWITCHING DEVICES, EACH CONNECTED IN SERIES WITH A D.C. POWER MEANS AND AN INDUCTIVE A.C. LOAD WINDING FOR ALTERNATELY APPLYING CURRENT IN REVERSE DIRECTIONS THROUGH SAID LOAD WINDING, A CURRENT LIMITING BALLAST MEANS CONNECTED IN SERIES WITH EACH OF SAID SWITCHING DEVICES AND SAID LOAD WINDING, SAID BALLAST MEANS COMPRISING A SATURABLE REACTOR DEVICE, SAID IMPROVED CIRCUIT FURTHER COMPRISING A SHUNT CIRCUIT CONNECTED ACROSS SAID BALLAST MEANS, SAID SHUNT CIRCUIT COMPRISING A RECTIFIER DEVICE CONNECTED IN PARALLEL WITH SAID SATURABLE REACTOR DEVICE TO DISCHARGE PERIODICALLY A SIGNIFICANT PORTION OF THE ENERGY STORED IN SAID REACTOR
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) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |