US3422844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible check valve
Assignee: GRIMAR Inc
•
Filing: 1965-03-05
•
Granted: 1969-01-21
•
Expires: 1985-03-05
Abstract
No abstract record available.
Inventors
- 👤 Frederick G J Grise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:48
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K15/147; F16K15/1441; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/788; Y10T137/7882; Y10T137/7883
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US621849A
Cited
US2328382A
Cited
US2598002A
Cited
US2642259A
Cited
US2670757A
Cited
US2875776A
Cited
US2981276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |