Patent US2720865A successfully refreshed from Google Patents.
US2720865A
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US
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Fluid pressure operated control systems
Assignee: Electro Hydraulics Ltd
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Filing: 1951-01-03
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Granted: 1955-10-18
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Expires: 1971-01-03
Abstract
No abstract record available.
Inventors
- 👤 Perdue Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:30
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/08; F15B11/12; F15B11/121; F15B11/123; B; B64; B64C; B64C13/00; B64C25/00; B64C25/32; B64C25/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1799298A
Cited
US2005387A
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US2401197A
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US2527943A
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US2484603A
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US2478790A
Cited
US2489450A
Cited
GB625711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |