Patent US2631571A successfully refreshed from Google Patents.
US2631571A
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Hydraulic motor and control valve
Assignee: Northrop Grumman Corp
•
Filing: 1948-03-29
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Granted: 1953-03-17
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Expires: 1968-03-29
Abstract
No abstract record available.
Inventors
- 👤 Warde L Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:09
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/02; F15B9/08; F15B9/10; B; B64; B64C; B64C13/00; B64C13/24; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/86702; Y10T137/86879
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US526930A
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US763694A
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US1928144A
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US1967851A
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US2432502A
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US2380705A
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US2424901A
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US2359802A
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US2555115A
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US2476763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |