US3416057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A.c. motor speed control system using selected voltage levels inverted at selected frequencies and method
Assignee: GAYLORD RIVES CO
•
Filing: 1966-04-06
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Granted: 1968-12-10
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Expires: 1986-04-06
Abstract
No abstract record available.
Inventors
- 👤 Stanley G Froyd
- 👤 Keith L Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:25
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; H02P27/06; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871; H02P27/047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2784365A
Cited
US3105180A
Cited
US3289062A
Cited
US3351835A
Cited
US3344326A
Cited
US3343063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |