Patent US3390616A successfully refreshed from Google Patents.
US3390616A
Expired / Lapsed
US
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Fluid pressure cylinders having load responsive piston valves
Assignee: WILLIAM L HAMMER
•
Filing: 1965-10-19
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Granted: 1968-07-02
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Expires: 1985-10-19
Abstract
No abstract record available.
Inventors
- 👤 William L Hammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:28
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1447; F15B15/149
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2646025A
Cited
US2875732A
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US2858804A
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US2986123A
Cited
US2980135A
Cited
US3060895A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |