US3418557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage control system involving timed energization of a pair of power handling transistors
Assignee: Technipower Inc
•
Filing: 1966-03-02
•
Granted: 1968-12-24
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Expires: 1986-03-02
Abstract
No abstract record available.
Inventors
- 👤 Johannes M Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:25
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33538; H02M3/33546; H02M3/337; H02M3/3376; H02M3/3378
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2987665A
Cited
US3185912A
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US3219906A
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US3334292A
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US3197691A
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US3219907A
Cited
US3324377A
Cited
US3341765A
Cited
US3325716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |