Patent US3561893A successfully refreshed from Google Patents.
US3561893A
Expired / Lapsed
US
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Hydrostatic control equipment' partic-ularly for steering systems
Assignee: Danfoss AS
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Filing: 1968-11-19
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Granted: 1971-02-09
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Expires: 1988-11-19
Abstract
Abstract THE INVENTION RELATES TO A HYDROSTATIC CONTROL UNIT OF THE GENERAL TYPE USED FOR VEHICLE STEERING SYSTEMS. A GEROTOR GEAR SET IS USED FOR THE METERING UNIT AND A PAIR OF PLATE TYPE VALVES ARE COOPERABLE WITH THE GEROTOR UNIT. A DRIVE ASSEMBLY IS PROVIDED BETWEEN THE GEROTOR UNIT AND THE VALVES WHICH FUNCTIONS AS A DRIVE BETWEEN THE GEROTOR AND ONE OF THE VALVES AND AS A MEANS FOR PROVIDING LIMITED RELATIVE ROTATIONAL MOVEMENT BETWEEN THE VALVES FOR CONTROL PURPOSES.
Inventors
- 👤 Johannes Vagn Battrup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:47
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/02; B; B62; B62D; B62D5/00; B62D5/06; B62D5/09; B62D5/093; B62D5/097
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |