Patent US3508564A successfully refreshed from Google Patents.
US3508564A
Expired / Lapsed
US
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Electro-fluidic active devices
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1967-04-10
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Granted: 1970-04-28
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Expires: 1987-04-10
Abstract
No abstract record available.
Inventors
- 👤 Desmond J Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:44
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/02; F15C1/04; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2082; Y10T137/218; Y10T137/2191
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2661596A
Cited
US3324891A
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FR1303872A
Cited
US3258685A
Cited
US3272215A
Cited
US3266514A
Cited
US3388713A
Cited
US3390693A
Cited
US3416549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-27 | 1973-10-27 | 1974-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-27 | 1977-10-27 | 1978-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-27 | 1981-10-27 | 1982-04-28 | $7700.00 | Window Closed / Lapsed |