Patent US3563675A successfully refreshed from Google Patents.
US3563675A
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US
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Hydraulic pump
Assignee: Sundstrand Corp
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Filing: 1968-10-11
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Granted: 1971-02-16
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Expires: 1988-10-11
Abstract
Abstract A PRESSURE COMPENSATED VARIABLE DISPLACEMENT PUMP FOR MAINTAINING SUBSTANTIALLY CONSTANT PUMP DISCHARGE PRESSURE WITH A DEPRESSURIZATION VALVE FOR SELECTIVELY EFFECTING A REDUCTION IN PUMP DISCHARGE PRESSURE BY PRESSURIZING THE NORMALLY LOW PRESSURE SIDE OF A PRESSURE COMPENSATOR VALVE CONSTRUCTED TO NORMALLY MAINTAIN A PREDETERMINED HIGH PUMP DISCHARGE PRESSURE.
Inventors
- 👤 Donald A Straznickas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:42
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/08; F04B1/00; F04B1/12; F04B1/26; F04B1/30; F04B1/32; F04B1/324
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |