US3148592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic brake booster
Assignee: Motors Liquidation Co
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Filing: 1963-05-27
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Granted: 1964-09-15
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Expires: 1983-05-27
Abstract
No abstract record available.
Inventors
- 👤 Raymond J Schultz
- 👤 Jr Paul E Jaquish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:21
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/16; B60T13/161; B60T13/162; B60T13/163
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
IN A HYDRAULIC BRAKE BOOSTER HAVING A SOURCE OF DYNAMIC HYDRAULIC PRESSURE AND A POWER PISTON AND OPEN CENTER VALVE MEANS ACTUATABLE TO RESTRICT FLUID FLOW TO BUILD UP A PRESSURE DIFFERENTIAL ACTING ON SAID POWER PISTON, MEANS INCLUDING SAID VALVE MEANS FOR LIMITING THE PRESSURE DIFFERENTIAL ACTING ON SAID POWER PISTON AND COMPRISING, A VALVE SEAT, A MANUALLY DISPLACEABLE MEMBER HAVING A CYLINDER FORMED THEREIN, A VALVE SPOOL RECIPROCABLY RECEIVED IN SAID CYLINDER AND HAVING A VALVE ELEMENT FORMED THEREON MOVABLE WITH SAID MANUALLY DISPLACEABLE MEMBER TOWARD SAID VALVE SEAT TO RESTRICT FLUID FLOW, AND RESILIENT SPOOL ENGAGING MEANS URGING SAID SPOOL TOWARD SAID VALVE SEAT IN OPPOSITION TO THE PRESSURE DIFFERENTIAL ACTING ON SAID POWER PISTON AND HAVING A PREDETERMINED RATE AT WHICH THE POWER PISTON PRESSURE DIFFERENTIAL TENDS TO MOVE SAID SPOOL AWAY FROM SAID VALVE SEAT TO TEND TO INCREASE FLUID FLOW AND THEREBY LIMIT THE POWER PISTON PRESSURE DIFFERENTIAL.
Claim 2
Dependent Claim
154 words
IN A HYDRAULIC BRAKE BOOSTER HAVING A SOURCE OF DYNAMIC HYDRAULIC PRESSURE AND A POWER PISTON AND OPEN CENTER VALVE MEANS ACTUATABLE TO RESTRICT FLUID FLOW TO BUILD UP A PRESSURE DIFFERENTIAL ACTING ON SAID POWER PISTON, MEANS INCLUDING SAID VALVE MEANS FOR LIMITING THE PRESSURE DIFFERENTIAL ACTING ON SAID POWER PISTON AND COMPRISING, A VALVE SEAT, A MANUALLY DISPLACEABLE MEMBER HAVING A CYLINDER FORMED THEREIN, A VALVE SPOOL RECIPROCABLY RECEIVED IN SAID CYLINDER AND HAVING A VALVE ELEMENT FORMED THEREON MOVABLE WITH SAID MANUALLY DISPLACEABLE MEMBER TOWARD SAID VALVE SEAT TO RESTRICT FLUID FLOW, AND RESILIENT SPOOL ENGAGING MEANS URGING SAID SPOOL TOWARD SAID VALVE SEAT IN OPPOSITION TO THE PRESSURE DIFFERENTIAL ACTING ON SAID POWER PISTON AND HAVING A PREDETERMINED RATE AT WHICH THE POWER PISTON PRESSURE DIFFERENTIAL TENDS TO MOVE SAID SPOOL AWAY FROM SAID VALVE SEAT TO TEND TO INCREASE FLUID FLOW AND THEREBY LIMIT THE POWER PISTON PRESSURE DIFFERENTIAL.
References Cited (Backward Citations)
US2957311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |