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Patent US3409814A successfully refreshed from Google Patents.
US3409814A
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Variable pulse system for controlling dc motor speed by variation of supplied current
Assignee: Fujitsu Ltd
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Filing: 1966-03-09
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Granted: 1968-11-05
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Expires: 1986-03-09
Abstract
No abstract record available.
Inventors
- 👤 Azuma Yasuo
- 👤 Takeuchi Tamotu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:47
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/54; H; H02; H02H; H02H7/00; H02H7/08; H02H7/093; H02P; H02P23/00; H02P23/22; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; H02P7/2913; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/921
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2798997A
Cited
US3079539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |