Patent US2892101A successfully refreshed from Google Patents.
US2888233A
Expired / Lapsed
US
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Pilot operated valve
Assignee: Hays Manufacturing Co
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Filing: 1956-08-06
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Granted: 1959-05-26
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Expires: 1976-08-06
Abstract
No abstract record available.
Inventors
- 👤 Richard T Windsor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:43
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/40; F16K31/406; F16K31/408; H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/10; H01F7/12; H01F7/1205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US893305A
Cited
US2181423A
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US2251441A
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US2336887A
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US2587357A
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US2629401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |