Patent US3605409A successfully refreshed from Google Patents.
US3605409A
Expired / Lapsed
US
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Hydraulic actuator
Assignee: Parker Hannifin Corp
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Filing: 1969-04-01
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Granted: 1971-09-20
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Expires: 1989-04-01
Abstract
Abstract A HYDRAULIC ROTARY ACTUATOR THAT IS PROVIDED WITH INTEGRAL RELIEF VALVES IN THE PISTONS FOR PROTECTIVE PURPOSES. THE ACTUATOR ALSO HAS A SELF-CONTAINED, HYDRAULIC SYSTEM THAT FEATURES AN ENLARGED GEAR CHAMBER THAT SERVES BOTH AS A MOUNTING BASE FOR A PUMP OR POWER SOURCE AND AS A SUMP OR RESERVOIR FOR THE HYDRAULIC COMPONENT THAT, IN TURN, ACTUATES THE ACTUATOR. A FURTHER CHARACTERISTIC OF THE HYDRAULIC ACTUATOR IS THE OPTIONAL PROVISION OF A SHOCK ABSORBING COMPONENT ADAPTED TO CUSHION THE ACTUATED PISTON TOWARD THE END OF ITS POWER STROKE. ALSO, THE RACK SUPPORTING MEANS ARE INTERCONNECTED TO THE MAIN HOUSING SO AS TO, AT ALL TIMES, PROVIDE IMPROVED SUPPORT.
Inventors
- 👤 William E Heese
- 👤 Kenneth H Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:57
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/18
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |