Patent US2936779A successfully refreshed from Google Patents.
US2936779A
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US
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Flapper valve
Assignee: Sierra Engineering Co
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Filing: 1956-10-11
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Granted: 1960-05-17
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Expires: 1976-10-11
Abstract
No abstract record available.
Inventors
- 👤 Bob A Kindred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:24
CPC Classifications
A; A62; A62B; A62B9/00; A62B9/02; A61; A61M; A61M16/00; A61M16/20; A61M16/208; F; F16; F16K; F16K15/00; F16K15/14; F16K15/148; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/7888; Y10T137/789
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2133575A
Cited
US2168695A
Cited
US2225395A
Cited
DE734899C
Cited
GB622821A
Cited
US2646063A
Cited
US2672293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |