Patent US2889815A successfully refreshed from Google Patents.
US2889815A
Expired / Lapsed
US
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Pressure feedback servo valve
Assignee: Westinghouse Electric Corp
•
Filing: 1956-07-20
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Granted: 1959-06-09
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Expires: 1976-07-20
Abstract
No abstract record available.
Inventors
- 👤 Wayne B Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:08
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/043; F15B13/0438; F15B13/0431
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2400126A
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US2370137A
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US2466041A
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US2526709A
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US2570624A
Cited
US2767689A
Cited
US2738772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |