US3461372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
D.c. to a.c. power converter
Assignee: International Standard Electric Corp
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Filing: 1966-01-17
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Granted: 1969-08-12
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Expires: 1986-01-17
Abstract
Abstract A D.C. to A.C. converter in which power from a D.C. source fed through the collector-emitter circuit of a transistor is alternately switched on and off by a square wave applied to the base of said transistor. The lower even harmonics are attenuated by a plurality of series resonant circuits, each connected between the collector and emitter, while the lower odd harmonics are blocked from the output by a series of parallel resonant circuits connected between the collector and output, thereby providing a sinusoidal output at a frequency equal to the fundamental frequency of said square wave.
Inventors
- 👤 Clive Parnell Pickup
- 👤 John R Barton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:06
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H03; H03F; H03F3/00; H03F3/20; H03F3/21; H03F3/217; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2052888A
Cited
GB410182A
Cited
US2149077A
Cited
US2579525A
Cited
CH272405A
Cited
US2675474A
Cited
US2995709A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-11 | 1973-02-10 | 1973-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-11 | 1977-02-10 | 1977-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-11 | 1981-02-10 | 1981-08-12 | $7700.00 | Window Closed / Lapsed |