US3283504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proportioning valve
Assignee: ZF Active Safety US Inc
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Filing: 1964-07-31
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Granted: 1966-11-08
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Expires: 1984-07-31
Abstract
No abstract record available.
Inventors
- 👤 Stelzer William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:58
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/7772; Y10T137/7781; Y10T137/7793; Y10T137/7808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
IN A HYDRAULIC BRAKE SYSTEM COMPRISING A MASTER CYLINDER, FRONT AND REAR WHEEL BRAKE CYLINDERS, AND MEANS HYDRAULICALLY CONNECTING SAID MASTER CYLINDER TO SAID WHEEL CYLINDERS, THAT IMPROVEMENT WHICH COMPRISES A PROPORTIONING VALVE DEVICE IN THE HYDRAULIC CONNECTION BETWEEN SAID MASTER CYLINDER AND REAR WHEEL CYLINDERS FOR MAINTAINING DIFFERENTIAL PRESSURE IN THE FRONT AND REAR WHEEL CYLINDERS DURING A PORTION OF THE BREAKING OPERATION, SAID DEVICE COMPRISING A CASING HAVING AN INLET CONNECTION WITH SAID MASTER CYLINDER AND AN OUTLET BEING RORMED WITH SAID REAR WHEEL CYLINDERS, SAID CASING BEING FORMED WITH TWO CYLINDERS OF DIFFERENT DIAMETER BORES, A STEPPED PISTON HAVING A SMALL HEAD AND A LARGER HEAD FITTING SAID CYLINDERS AND SLIDABLY MOUNTED FOR AXIAL MOVEMENT THEREIN, A SPACE IN SAID CASING INTERMEDIATE SAID HEADS CONNECTED TO SAID INLET, A CHAMBER AT THE END OF SAID LARGER DIAMETER CYLINDER OPPOSITE SAID SPACE CONNECTED TO SAID OUTLET, PAS-
Claim 2
Dependent Claim
149 words
IN A HYDRAULIC BRAKE SYSTEM COMPRISING A MASTER CYLINDER, FRONT AND REAR WHEEL BRAKE CYLINDERS, AND MEANS HYDRAULICALLY CONNECTING SAID MASTER CYLINDER TO SAID WHEEL CYLINDERS, THAT IMPROVEMENT WHICH COMPRISES A PROPORTIONING VALVE DEVICE IN THE HYDRAULIC CONNECTION BETWEEN SAID MASTER CYLINDER AND REAR WHEEL CYLINDERS FOR MAINTAINING DIFFERENTIAL PRESSURE IN THE FRONT AND REAR WHEEL CYLINDERS DURING A PORTION OF THE BREAKING OPERATION, SAID DEVICE COMPRISING A CASING HAVING AN INLET CONNECTION WITH SAID MASTER CYLINDER AND AN OUTLET BEING RORMED WITH SAID REAR WHEEL CYLINDERS, SAID CASING BEING FORMED WITH TWO CYLINDERS OF DIFFERENT DIAMETER BORES, A STEPPED PISTON HAVING A SMALL HEAD AND A LARGER HEAD FITTING SAID CYLINDERS AND SLIDABLY MOUNTED FOR AXIAL MOVEMENT THEREIN, A SPACE IN SAID CASING INTERMEDIATE SAID HEADS CONNECTED TO SAID INLET, A CHAMBER AT THE END OF SAID LARGER DIAMETER CYLINDER OPPOSITE SAID SPACE CONNECTED TO SAID OUTLET, PAS-
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) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |