US2657897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve with resilient pressure actuated seal
Assignee: ACF Industries Inc
•
Filing: 1947-07-30
•
Granted: 1953-11-03
•
Expires: 1967-07-30
Abstract
No abstract record available.
Inventors
- 👤 Clyde H Folmsbee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:33
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/32; F16K1/34; F16K1/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190412911A
Cited
US1792945A
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US1868665A
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US1808254A
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US1861916A
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US1983163A
Cited
US2114789A
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US2123477A
Cited
US2147332A
Cited
US2417494A
Cited
US2431437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |