US3383578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous mode motor speed control system
Assignee: Ampex Corp
•
Filing: 1964-10-26
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Granted: 1968-05-14
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Expires: 1984-10-26
Abstract
No abstract record available.
Inventors
- 👤 Martyn A Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; H02P7/2885; G; G11; G11B; G11B15/00; G11B15/18; G11B15/20; G11B15/46; G11B15/54; H02P7/29; H02P7/2913; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/91
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |