US2880708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced pressure-regulating hydraulic servo valve
Assignee: Lockheed Martin Corp
•
Filing: 1954-11-22
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Granted: 1959-04-07
•
Expires: 1974-11-22
Abstract
No abstract record available.
Inventors
- 👤 Paul F Hayner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:09
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/16; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87193; Y10T137/87201; Y10T137/87209
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US957511A
Cited
US1420256A
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US1119640A
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US1966841A
Cited
US2069540A
Cited
GB515617A
Cited
US2400126A
Cited
US2582088A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |