US2980136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic flow control system and valve with anti-cavitation feature
Assignee: Cessna Aircraft Co
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Filing: 1959-06-25
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Granted: 1961-04-18
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Expires: 1979-06-25
Abstract
No abstract record available.
Inventors
- 👤 Robert D Krehbiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:53
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; E; E02; E02F; E02F9/00; E02F9/20; E02F9/22; E02F9/226; F15B13/04; F15B21/00; F15B21/04; F15B21/047; F16; F16K; F16K25/00; F16K25/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/877; Y10T137/87829; Y10T137/87837; Y10T137/87845
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |