US3395727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve
Assignee: Anderson Greenwood and Co
•
Filing: 1965-03-01
•
Granted: 1968-08-06
•
Expires: 1985-03-01
Abstract
No abstract record available.
Inventors
- 👤 Irvin B Weise
- 👤 Henry G Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:44
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/033; Y; Y10; Y10T; Y10T137/00; Y10T137/5327; Y10T137/5497; Y10T137/5503; Y10T137/5515; Y10T137/5521; Y10T137/7504; Y10T137/7722; Y10T137/7837; Y10T137/7854; Y10T137/7857; Y10T137/7898; Y10T137/7901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US298865A
Cited
US662711A
Cited
US940182A
Cited
US2482198A
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US2419318A
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US2767735A
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US2744539A
Cited
US3172424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-06 | 1972-02-05 | 1972-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-06 | 1976-02-05 | 1976-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-06 | 1980-02-05 | 1980-08-06 | $7700.00 | Window Closed / Lapsed |