US2634752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanically operated check valve
Assignee: Individual
•
Filing: 1949-12-02
•
Granted: 1953-04-14
•
Expires: 1969-12-02
Abstract
No abstract record available.
Inventors
- 👤 Mckay H Dexter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:07
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/18; F16K15/184; F16K15/02; F16K15/06; F16K15/063; F16K15/066; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/8593; Y10T137/86928; Y10T137/86936; Y10T137/86944; Y10T137/86968
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1215146A
Cited
DE420663C
Cited
US1998913A
Cited
US2460196A
Cited
US2355692A
Cited
US2426065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-13 | 1956-10-13 | 1957-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-13 | 1960-10-13 | 1961-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-13 | 1964-10-13 | 1965-04-14 | $7700.00 | Window Closed / Lapsed |