Patent US2957043A successfully refreshed from Google Patents.
Patent US3168351A successfully refreshed from Google Patents.
US3168351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor vehicle hydraulic brake system
Assignee: ZF Active Safety US Inc
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Filing: 1961-05-05
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Granted: 1965-02-02
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Expires: 1981-05-05
Abstract
No abstract record available.
Inventors
- 👤 Stelzer William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:18
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26; B60T8/28; B60T8/282; B60T11/00; B60T11/10; B60T11/16; B60T11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
IN A HYDRAULIC BRAKE SYSTEM FOR A MOTOR VEHICLE HAVING A PLURALIT OF WHEEL CYLINDERS, A MASTER CYLINDER HAVING A PAIR OF PLUNGERS THEREIN DEFINING THEREBETWEEN A FIRST PRESSURE CHAMBER, A DUCT CONNECTING SUCH PRESSURE CHAMBER WITH CERTAIN OF SAID WHEEL CYLINDERS, THE SIDE OF ONE OF SAID PLUNGERS OPPOSITE SAID PRESSURE CHAMBER FORMING WITH THE ADJACENT END OF SAID MASTER CYLINDER A SECOND PRESSURE CHAMBER COMMUNICATING WITH THE OTHER WHEEL CYLINDERS, MEANS FOR SUPPLYING FORCE TO THE OTHER PLUNGER TO DISPALCE FLUID FROM SAID OINE CHAMBER THROUGH SAID DUCT TO SAID CERTAIN WHEEL CYLINDERS AND TO TRANSMIT MOVEMENT TO SAID ONE PLUNGER TO DISPLACE FLUID FROM SAID SECOND CHAMBER TO THE OTHER WHEEL CYLINDERS, AND A DEVICE IN SAID DUCT NORMALLY OPERATIVE FOR PASSING FLUID THERETHROUGH FROM SAID FIRST CHAMBER TO SAID CERTAIN WHEEL CYLINDERS, SAID DEVICE COMPRISING AN AUXILIARY CYLINDER, A PISTON IN SUCH CYLINDER, ONE END OF SAID AUXILIARY CYLINDER COMMUNICATING WITH SAID FIRST PRESSURE CHAMBER AND THE OTHER END COMMUNICATING WITH SAID CERTAIN WHEEL CYLIN-
Claim 2
Dependent Claim
169 words
IN A HYDRAULIC BRAKE SYSTEM FOR A MOTOR VEHICLE HAVING A PLURALIT OF WHEEL CYLINDERS, A MASTER CYLINDER HAVING A PAIR OF PLUNGERS THEREIN DEFINING THEREBETWEEN A FIRST PRESSURE CHAMBER, A DUCT CONNECTING SUCH PRESSURE CHAMBER WITH CERTAIN OF SAID WHEEL CYLINDERS, THE SIDE OF ONE OF SAID PLUNGERS OPPOSITE SAID PRESSURE CHAMBER FORMING WITH THE ADJACENT END OF SAID MASTER CYLINDER A SECOND PRESSURE CHAMBER COMMUNICATING WITH THE OTHER WHEEL CYLINDERS, MEANS FOR SUPPLYING FORCE TO THE OTHER PLUNGER TO DISPALCE FLUID FROM SAID OINE CHAMBER THROUGH SAID DUCT TO SAID CERTAIN WHEEL CYLINDERS AND TO TRANSMIT MOVEMENT TO SAID ONE PLUNGER TO DISPLACE FLUID FROM SAID SECOND CHAMBER TO THE OTHER WHEEL CYLINDERS, AND A DEVICE IN SAID DUCT NORMALLY OPERATIVE FOR PASSING FLUID THERETHROUGH FROM SAID FIRST CHAMBER TO SAID CERTAIN WHEEL CYLINDERS, SAID DEVICE COMPRISING AN AUXILIARY CYLINDER, A PISTON IN SUCH CYLINDER, ONE END OF SAID AUXILIARY CYLINDER COMMUNICATING WITH SAID FIRST PRESSURE CHAMBER AND THE OTHER END COMMUNICATING WITH SAID CERTAIN WHEEL CYLIN-
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) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |