US3706022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High efficiency capacitor charging circuit
Assignee: United States Department of the Army
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Filing: 1971-11-04
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Granted: 1972-12-12
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Expires: 1991-11-04
Abstract
Abstract THIS DISCLOSURE RELATES TO CHARGING CIRCUITS AND, PARTICULARLY, TO CIRCUITS FOR CONVERTING D-C VOLTAGE FROM A LOW LEVEL TO A HIGH LEVEL FOR CAPACITOR CHARGING. MORE PARTICULARLY THIS DISCLOSURE DESCRIBES A CIRCUIT FOR CONVERTING A LOW-LEVEL, D-C VOLTAGE TO A HIGH-LEVEL, D-C, CAPACITOR-CHARGING VOLTAGE IN A SERIES OF STEPS OF INCREASING VOLTAGE TO MAINTAIN A RELATIVELY-HIGH RATE OF CHARGE AND EFFICIENCY DURING THE ENTIRE CHARGING TIME FROM ZERO VOLTAGE TO THE FULL VOLTAGE.
Inventors
- 👤 Earl E Corey
- 👤 Richard A Tuft
- 👤 Jason H Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:48
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/337; H02M3/3372
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |