US3249173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power steering system
Assignee: Doosan Bobcat North America Inc
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Filing: 1963-12-20
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Granted: 1966-05-03
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Expires: 1983-12-20
Abstract
No abstract record available.
Inventors
- 👤 Richard O Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:02
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/06; B62D5/09; B62D5/093
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
245 words
A POWER STEERING SYSTEM COMPRISING A FLUID MOTOR, A FLUID RESERVOIR, A LOW VOLUME SOURCE OF PRESSURZIED FLUID CONNECTED TO THE SAID RESERVOIR, A HIGH VOLUME SOURCE OF PRESSURIZED FLUID CONNECTED TO THE SAID RESERVOIR, A FIRST FLUID CONTROL VALVE CONNECTED TO THE SAID RESERVOIR, A FIRST VOLUME SOURCE OF PRESSURE FLUID AND FLUID MOTOR FOR DIRECTING FLUID FROM THE SAID LOW VOLUME SOURCE EITHER TO THE SAID RESERVOIR OR MOTOR, THE SAID FIRST VALVE INCLUDING A HOUSING, A BORE IN THE SAID HOUSING, A SPOOL SLIDABLY DISPOSED IN THE SAID BORE FOR DIRECTING FLUID FLOWING THROUGH THE SAID FIRST VALVE TO THE SAID RESERVOIR WHEN THE SAID SPOOL IS IN A CENTERED POSITION AND TO THE SAID MOTOR WHEN THE SAID SPOOL IS SHIFTED AWAY FROM THE SAID CENTERED POSITION AND MEANS TENDING TO MAINTAIN THE SAID SPOOL IN THE SAID CENTERED POSITION AND REQUIRING A PREDETERMINED FORCE TO SHIFT THE SAID SPOOL AWAY FROM THE SAID CENTERED POSITION, A SECOND FLUID CONTROL VALVE CONNECTED TO THE SAID RESERVOIR, HIGH VOLUME SOURCE OF PRESSURE FLUID AND FLUID MOTOR FOR DIRECTING FLUID FROM THE SAID HIGH VOLUME SOURCE EITHER TO THE SAID RESERVOIR OR MOTOR, THE SAID SECOND VALVE INCLUDING A HOUSING, A BORE IN THE SAID HOUSING, A SPOOL SLIDABLY DISPOSED IN THE SAID BORE FOR DIRECTING FLUID FLOWING THROUGH THE SAID SECOND VALVE TO THE SAID RESERVOIR WHEN THE SAID SECOND VALVE SPOOL IS IN A CENTERED POSITION AND TO THE SAID MOTOR
Claim 2
Dependent Claim
245 words
A POWER STEERING SYSTEM COMPRISING A FLUID MOTOR, A FLUID RESERVOIR, A LOW VOLUME SOURCE OF PRESSURZIED FLUID CONNECTED TO THE SAID RESERVOIR, A HIGH VOLUME SOURCE OF PRESSURIZED FLUID CONNECTED TO THE SAID RESERVOIR, A FIRST FLUID CONTROL VALVE CONNECTED TO THE SAID RESERVOIR, A FIRST VOLUME SOURCE OF PRESSURE FLUID AND FLUID MOTOR FOR DIRECTING FLUID FROM THE SAID LOW VOLUME SOURCE EITHER TO THE SAID RESERVOIR OR MOTOR, THE SAID FIRST VALVE INCLUDING A HOUSING, A BORE IN THE SAID HOUSING, A SPOOL SLIDABLY DISPOSED IN THE SAID BORE FOR DIRECTING FLUID FLOWING THROUGH THE SAID FIRST VALVE TO THE SAID RESERVOIR WHEN THE SAID SPOOL IS IN A CENTERED POSITION AND TO THE SAID MOTOR WHEN THE SAID SPOOL IS SHIFTED AWAY FROM THE SAID CENTERED POSITION AND MEANS TENDING TO MAINTAIN THE SAID SPOOL IN THE SAID CENTERED POSITION AND REQUIRING A PREDETERMINED FORCE TO SHIFT THE SAID SPOOL AWAY FROM THE SAID CENTERED POSITION, A SECOND FLUID CONTROL VALVE CONNECTED TO THE SAID RESERVOIR, HIGH VOLUME SOURCE OF PRESSURE FLUID AND FLUID MOTOR FOR DIRECTING FLUID FROM THE SAID HIGH VOLUME SOURCE EITHER TO THE SAID RESERVOIR OR MOTOR, THE SAID SECOND VALVE INCLUDING A HOUSING, A BORE IN THE SAID HOUSING, A SPOOL SLIDABLY DISPOSED IN THE SAID BORE FOR DIRECTING FLUID FLOWING THROUGH THE SAID SECOND VALVE TO THE SAID RESERVOIR WHEN THE SAID SECOND VALVE SPOOL IS IN A CENTERED POSITION AND TO THE SAID MOTOR
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |