US3491791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flutter valve and method of making same
Assignee: CR Bard Inc
•
Filing: 1968-01-19
•
Granted: 1970-01-27
•
Expires: 1988-01-19
Abstract
No abstract record available.
Inventors
- 👤 Edwin Rico Polk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:34
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K15/147; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/788; Y10T137/7882; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1052; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49412; Y10T29/49416
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1702974A
Cited
US2696342A
Cited
US2594318A
Cited
US2700165A
Cited
US2652336A
Cited
US2697531A
Cited
US2799314A
Cited
US3423907A
Cited
US3361334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |