US3457956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-hydraulic servo control valve
Assignee: Dowty Technical Developments Ltd
•
Filing: 1967-02-10
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Granted: 1969-07-29
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Expires: 1987-02-10
Abstract
No abstract record available.
Inventors
- 👤 Thomas D H Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:49
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/043; F15B13/0438; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/8659
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3126026A
Cited
US2641279A
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US2625136A
Cited
US2824574A
Cited
US3001549A
Cited
US3167632A
Cited
US3304953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |