Patent US2540371A successfully refreshed from Google Patents.
US2540371A
Expired / Lapsed
US
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Diaphragm valve
Assignee: Flowserve Corp
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Filing: 1945-07-06
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Granted: 1951-02-06
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Expires: 1965-07-06
Abstract
No abstract record available.
Inventors
- 👤 Jacobsen Oystein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:49
CPC Classifications
F; F16; F16K; F16K7/00; F16K7/12; F16K7/14; F16K7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US774985A
Cited
US685396A
Cited
US1121825A
Cited
GB104400A
Cited
US1227459A
Cited
US1800157A
Cited
US1992043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |