US3315469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure proportioning valve
Assignee: ZF Active Safety US Inc
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Filing: 1965-07-14
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Granted: 1967-04-25
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Expires: 1985-07-14
Abstract
No abstract record available.
Inventors
- 👤 Stelzer William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:21
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A PROPORTIONING VALVE ADAPTED TO BE INTERPOSED BETWEEN A FLUID MOTOR AND A BRAKE CYLINDER OF A VEHICULAR HYDRAULIC BRAKE SYSTEM INCLUDING A HOUSING HAVING AN INLET OPENING, AN OUTLET OPENING AND A CHAMBER PROVIDING COMMUNICATION BETWEEN SAID INLET OPENING AND SAID OUTLET OPENING; A PISTON IN SAID CHAMBER MOVABLE IN RESPONSE TO A PREDETERMINED PRESSURE DIFFERENTIAL BETWEEN SAID INLET OPENING AND SAID OUTLET OPENING; A VALVE ELEMENT CARRIED BY SAID PISTON OPERABLE TO BLOCK FLUID COMMUNICATION BETWEEN SAID INLET OPENING AND SAID OUTLET OPENING; AND ELASTOMERIC VALVE MEANS EXPOSED TO INLET FLUID PRESSURE ON ONE SIDE THEREOF AND HAVING RECESS MEANS ON THE OPPOSITE SIDE THEREOF EXPOSED TO OUTLET FLUID PRESSURE, SAID VALVE MEANS BEING COMPRESSIBLE IN RESPONSE TO AN INCREASE IN INLET FLUID PRESSURE OVER OUTLET FLUID PRESSURE AFTER CLOSURE OF SAID VALVE ELEMENT TO CONTRACT THE VOLUME OF SAID RECESS MEANS WHEREBY SAID RECESS MEANS WILL EXPAND UPON A SUBSEQUENT REDUCTION IN INLET FLUID PRESSURE TO RELIEVE OUTLET FLUID PRESSURE.
Claim 2
Dependent Claim
163 words
A PROPORTIONING VALVE ADAPTED TO BE INTERPOSED BETWEEN A FLUID MOTOR AND A BRAKE CYLINDER OF A VEHICULAR HYDRAULIC BRAKE SYSTEM INCLUDING A HOUSING HAVING AN INLET OPENING, AN OUTLET OPENING AND A CHAMBER PROVIDING COMMUNICATION BETWEEN SAID INLET OPENING AND SAID OUTLET OPENING; A PISTON IN SAID CHAMBER MOVABLE IN RESPONSE TO A PREDETERMINED PRESSURE DIFFERENTIAL BETWEEN SAID INLET OPENING AND SAID OUTLET OPENING; A VALVE ELEMENT CARRIED BY SAID PISTON OPERABLE TO BLOCK FLUID COMMUNICATION BETWEEN SAID INLET OPENING AND SAID OUTLET OPENING; AND ELASTOMERIC VALVE MEANS EXPOSED TO INLET FLUID PRESSURE ON ONE SIDE THEREOF AND HAVING RECESS MEANS ON THE OPPOSITE SIDE THEREOF EXPOSED TO OUTLET FLUID PRESSURE, SAID VALVE MEANS BEING COMPRESSIBLE IN RESPONSE TO AN INCREASE IN INLET FLUID PRESSURE OVER OUTLET FLUID PRESSURE AFTER CLOSURE OF SAID VALVE ELEMENT TO CONTRACT THE VOLUME OF SAID RECESS MEANS WHEREBY SAID RECESS MEANS WILL EXPAND UPON A SUBSEQUENT REDUCTION IN INLET FLUID PRESSURE TO RELIEVE OUTLET FLUID PRESSURE.
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) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |