US3147671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic actuator
Assignee: Motors Liquidation Co
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Filing: 1962-12-04
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Granted: 1964-09-08
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Expires: 1982-12-04
Abstract
No abstract record available.
Inventors
- 👤 Howard M Geyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:09
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1433
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A LINEAR HYDRAULIC ACTUATOR SUBJECT TO TENSION LOADS INCLUDING, A CYLINDER, A RECIPROCABLE PISTON DISPOSED IN SAID CYLINDER AND DIVIDING SAID CYLINDER INTO OPPOSED CHAMBERS, AN ELONGATE THIN-WALLED HOLLOW PISTON ROD ATTACHED TO SAID PISTON AND HAVING A CLOSED END DISPOSED OUTSIDE OF SAID CYLINDER, SAID PISTON HAVING UNEQUAL AREAS EXPOSED TO SAID OPPOSED CHAMBERS, PASSAGE MEANS THROUGH SAID PISTON LOCATED RADIALLY OUTWARD OF THE PISTON ROD AND A SPRING BIASED ONE-WAY CHECK VALVE CARRIED BY SAID PISTON AND DISPOSED IN SAID PASSAGE MEANS, SAID CHECK VALVE BLOCKING THE FLOW OF FLUID THROUGH SAID PASSAGE MEANS BETWEEN SAID CHAMBERS IN ONE DIRECTION AND PERMITTING FREE FLOW OF FLUID THROUGH SAID PASSAGE MEANS BETWEEN SAID CHAMBERS IN THE OPPOSITE DIRECTION WHEREBY PRESSURIZATION OF ONE OF SAID CHAMBERS WILL RESULT IN A TENDENCY FOR PRESSURE EQUALIZATION OF SAID CHAMBERS THROUGH SAID PASSAGE MEANS SO AS TO LIMIT THE COLUMN LOAD ON SAID ELONGATE THIN-WALLED HOLLOW PISTON ROD TO THE EFFECTIVE AREA OF SAID PISTON ROD.
Claim 2
Dependent Claim
163 words
A LINEAR HYDRAULIC ACTUATOR SUBJECT TO TENSION LOADS INCLUDING, A CYLINDER, A RECIPROCABLE PISTON DISPOSED IN SAID CYLINDER AND DIVIDING SAID CYLINDER INTO OPPOSED CHAMBERS, AN ELONGATE THIN-WALLED HOLLOW PISTON ROD ATTACHED TO SAID PISTON AND HAVING A CLOSED END DISPOSED OUTSIDE OF SAID CYLINDER, SAID PISTON HAVING UNEQUAL AREAS EXPOSED TO SAID OPPOSED CHAMBERS, PASSAGE MEANS THROUGH SAID PISTON LOCATED RADIALLY OUTWARD OF THE PISTON ROD AND A SPRING BIASED ONE-WAY CHECK VALVE CARRIED BY SAID PISTON AND DISPOSED IN SAID PASSAGE MEANS, SAID CHECK VALVE BLOCKING THE FLOW OF FLUID THROUGH SAID PASSAGE MEANS BETWEEN SAID CHAMBERS IN ONE DIRECTION AND PERMITTING FREE FLOW OF FLUID THROUGH SAID PASSAGE MEANS BETWEEN SAID CHAMBERS IN THE OPPOSITE DIRECTION WHEREBY PRESSURIZATION OF ONE OF SAID CHAMBERS WILL RESULT IN A TENDENCY FOR PRESSURE EQUALIZATION OF SAID CHAMBERS THROUGH SAID PASSAGE MEANS SO AS TO LIMIT THE COLUMN LOAD ON SAID ELONGATE THIN-WALLED HOLLOW PISTON ROD TO THE EFFECTIVE AREA OF SAID PISTON ROD.
References Cited (Backward Citations)
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US2598180A
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US778168A
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US1490633A
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FR1017411A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |