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US3501684A
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Dual polarity full wave dc motor drive
Assignee: National Aeronautics and Space Administration
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Filing: 1966-12-27
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Granted: 1970-03-17
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Expires: 1986-12-27
Abstract
No abstract record available.
Inventors
- 👤 Michael F Hanna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:02
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/12; H02P7/00; H02P7/03; H02P7/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2605454A
Cited
US3222587A
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US3302090A
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US3376486A
Cited
US3295037A
Cited
US3365642A
Cited
US3268148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |