Patent US1887310A successfully refreshed from Google Patents.
Patent US2481713A successfully refreshed from Google Patents.
US2481713A
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Flexible seal check valve
Assignee: Individual
•
Filing: 1945-04-30
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Granted: 1949-09-13
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Expires: 1965-04-30
Abstract
No abstract record available.
Inventors
- 👤 Bertea Alex
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:46
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/04; F16K15/044; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7854; Y10T137/7856; Y10T137/7866; Y10T137/7867; Y10T137/7879; Y10T137/7904; Y10T137/7922; Y10T137/7927; Y10T137/7928
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US125371A
Cited
GB190412911A
Cited
US1931938A
Cited
US1936975A
Cited
US2151442A
Cited
US2192339A
Cited
US2392501A
Cited
US2391899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-12 | 1953-03-14 | 1953-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-12 | 1957-03-14 | 1957-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-12 | 1961-03-14 | 1961-09-13 | $7700.00 | Window Closed / Lapsed |