Patent US3702601A successfully refreshed from Google Patents.
Patent US3396631A successfully refreshed from Google Patents.
US3396631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-driven engine with improved fluid amplifier valve means
Assignee: United States Department of the Army
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Filing: 1967-01-13
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Granted: 1968-08-13
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Expires: 1987-01-13
Abstract
No abstract record available.
Inventors
- 👤 Kenneth E Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:40
CPC Classifications
F; F01; F01B; F01B17/00; F01B17/02; F15; F15C; F15C1/00; F15C1/003; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/212; Y10T137/2125; Y10T137/2147; Y10T137/2153
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) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |