US3280557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety control circuit for power steering unit
Assignee: Ford Motor Co
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Filing: 1965-03-11
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Granted: 1966-10-25
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Expires: 1985-03-11
Abstract
No abstract record available.
Inventors
- 👤 Sven W Sattavara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:09
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/06; B62D5/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A DUAL FLUID SUPPLY CIRCUIT FOR A FLUID RECIRCULATING MECHANISM HAVING A FLUID INLET AND OUTLET, COMPRISING, A MAIN NORMALLY DRIVEN FLUID SUPPLY PUMP AND AN AUXILIARY NORMALLY AT REST FLUID SUPPLY PUMP EACH HAVING A FLUID DISCHARGE AND RETURN LINE, MEANS CONNECTING THE DISCHARGE LINES IN PARALLEL TO SAID INLET AND RETURN LINES IN PARALLEL TO THE OUTLET OF SAI MECHANISM, FIRST CONTROL MEANS IN SAID LINES BLOCKING THE FLOW OF FLUID BETWEEN SAID PUMPS, ADDITIONAL CONTROL MEANS IN ONE OF SAID RETURN LINES DIFFERENTIALLY OPERATED BY THE DISCHARGE PRESSURE FROM BOTH OF SAID PUMPS THEREAGAINST TO PERMIT OR BLOCK FLOW THROUGH SAID ONE LINE AS A FUNCTION OF THE OPERABILITY AND DISCHARGE PRESSURE OF SAID PUMPS, AND MEANS RESPONSIVE TO A PREDETERMINED OPERATION OF SAID MAIN PUMP TO ACTIVATE SAID AUXILIARY PUMP.
Claim 2
Dependent Claim
134 words
A DUAL FLUID SUPPLY CIRCUIT FOR A FLUID RECIRCULATING MECHANISM HAVING A FLUID INLET AND OUTLET, COMPRISING, A MAIN NORMALLY DRIVEN FLUID SUPPLY PUMP AND AN AUXILIARY NORMALLY AT REST FLUID SUPPLY PUMP EACH HAVING A FLUID DISCHARGE AND RETURN LINE, MEANS CONNECTING THE DISCHARGE LINES IN PARALLEL TO SAID INLET AND RETURN LINES IN PARALLEL TO THE OUTLET OF SAI MECHANISM, FIRST CONTROL MEANS IN SAID LINES BLOCKING THE FLOW OF FLUID BETWEEN SAID PUMPS, ADDITIONAL CONTROL MEANS IN ONE OF SAID RETURN LINES DIFFERENTIALLY OPERATED BY THE DISCHARGE PRESSURE FROM BOTH OF SAID PUMPS THEREAGAINST TO PERMIT OR BLOCK FLOW THROUGH SAID ONE LINE AS A FUNCTION OF THE OPERABILITY AND DISCHARGE PRESSURE OF SAID PUMPS, AND MEANS RESPONSIVE TO A PREDETERMINED OPERATION OF SAID MAIN PUMP TO ACTIVATE SAID AUXILIARY PUMP.
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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |