Patent US2941779A successfully refreshed from Google Patents.
US2941779A
Expired / Lapsed
US
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Rotary valve
Assignee: Henry Pratt Co LLC
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Filing: 1957-01-07
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Granted: 1960-06-21
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Expires: 1977-01-07
Abstract
No abstract record available.
Inventors
- 👤 Robert P Saar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:54
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/08; F16K5/14; F16K5/20; F16K5/204; F16K5/06; F16K5/0663; F16K5/0668
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US147532A
Cited
FR634185A
Cited
US1824511A
Cited
US2039075A
Cited
US2586927A
Cited
GB651114A
Cited
FR1008139A
Cited
US2809011A
Cited
US2741138A
Cited
FR1109643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |