US2898932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve apparatus
Assignee: Chapman Valve Manufacturing Co
•
Filing: 1956-04-03
•
Granted: 1959-08-11
•
Expires: 1976-04-03
Abstract
No abstract record available.
Inventors
- 👤 Edwin O Tefs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:59
CPC Classifications
F; F16; F16K; F16K49/00; F16K3/00; F16K3/30; F16K3/316; Y; Y10; Y10T; Y10T137/00; Y10T137/6416; Y10T137/6579; Y10T137/8593; Y10T137/86493; Y10T137/86879
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1545696A
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US1826941A
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US2048696A
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US2155315A
Cited
US2360389A
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FR941632A
Cited
US2742924A
Cited
US2764943A
Cited
US2622617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |