US2639725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot operated relief valve for pumps and the like
Assignee: Geo D Roper Corp
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Filing: 1946-04-29
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Granted: 1953-05-26
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Expires: 1966-04-29
Abstract
No abstract record available.
Inventors
- 👤 John R Albright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:59
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/24; F04C14/26; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/7722; Y10T137/7758; Y10T137/7759; Y10T137/7762; Y10T137/7769; Y10T137/777; Y10T137/8593; Y10T137/85978; Y10T137/85986; Y10T137/86002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |