US3676020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensated hydraulic device
Assignee: HARTMANN CONTROLS Inc C/O ROCKFORD AUTOMATION Inc 3381 FOREST VIEW ROAD ROCKFORD IL 61109 A CORP OF WI
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Filing: 1970-02-24
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Granted: 1972-07-11
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Expires: 1990-02-24
Abstract
Abstract AN AXIAL PISTON HYDRAULIC DEVICE HAVING AN ANGULARLY TILTABLE CAM PLATE INCLUDES A PAIR OF TILT CONTROL PISTON ASSEMBLIES, ONE OF WHICH INCLUDES A PLURALITY OF RESILIENT, PREFERABLY BIMETAL, DISCS. WHEN THE PRESSURE OF TEMPERATURE OF THE FLUID CHANGES, THE DISCS DEFORM IN RESPONSE THERETO TO EFFECT A CONTROLLED CHANGE IN THE TILT OF THE CAM PLATE TO ADJUST THE FLOW RATE OF THE DEVICE COMPENSATING FOR FLOW RATE CHANGES RESULTING FROM THE CHANGE IN PRESSURE OF TEMPERATURE. IN ADDITION, THE PLANE OF THE PIVOT AXES OF THE PISTONS OF THE DEVICE MAY BE OFFSET FROM THE PIVOT AXIS OF THE CAM PLATE TO FURTHER MODIFY THE FLOW RATE RESULTING FROM THE ACTION OF THE DISCS.
Inventors
- 👤 Howard P Andreasen
- 👤 Jay H Ankeny
- 👤 Harold W Foddy
- 👤 David W Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:29
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/08; F01; F01B; F01B3/00; F01B3/10; F01B3/103; F01B3/106; F04B49/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |