US2929401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve with plural seating
Assignee: Individual
•
Filing: 1957-03-11
•
Granted: 1960-03-22
•
Expires: 1977-03-11
Abstract
No abstract record available.
Inventors
- 👤 Herbert M Cowan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:17
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/32; F16K1/34; F16K1/46; F16K1/465; F16K1/42; F16K1/425; F16K15/00; F16K15/02; F16K15/04; F16K15/044; F16K17/00; F16K17/02; F16K17/04; F16K17/0406; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7866; Y10T137/7867; Y10T137/7868; Y10T137/7904; Y10T137/7922; Y10T137/7927; Y10T137/7929
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190412911A
Cited
US1444188A
Cited
US2417494A
Cited
US2624542A
Cited
US2552053A
Cited
US2739374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-22 | 1963-09-21 | 1964-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-22 | 1967-09-21 | 1968-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-22 | 1971-09-21 | 1972-03-22 | $7700.00 | Window Closed / Lapsed |