Patent US2947317A successfully refreshed from Google Patents.
US2947317A
Expired / Lapsed
US
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Unloading valves for hydraulic pumps
Assignee: Electraulic Presses Ltd
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Filing: 1956-10-31
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Granted: 1960-08-02
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Expires: 1976-10-31
Abstract
No abstract record available.
Inventors
- 👤 Towler Frank Hathorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:59
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/02; F15B15/06; F15B15/061; B; B30; B30B; B30B15/00; B30B15/16; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2642; Y10T74/00; Y10T74/15; Y10T74/1558; Y10T74/1565; Y10T74/1566; Y10T74/1568; Y10T74/1569
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2167369A
Cited
US2116456A
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US2243888A
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US2181978A
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US2372923A
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US2486256A
Cited
US2611319A
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US2835323A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |