US3140587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Divided output compound master cylinder
Assignee: ZF Active Safety US Inc
•
Filing: 1963-01-29
•
Granted: 1964-07-14
•
Expires: 1983-01-29
Abstract
No abstract record available.
Inventors
- 👤 Stelzer William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:32
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/16; B60T11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
IN A HYDRAULIC BRAKING SYSTEM INCLUDING TWO SETS OF WHEEL CYLINDERS TO APPLY THE BRAKES, IN COMBINATION, A MASTER CYLINDER, A FIRST AND SECOND FLUID DISPLACING MEANS THEREIN TO DISPLACE FLUID THEREFROM TO ONE SET OF WHEEL CYLINDERS, A THIRD AND FOURTH FLUID DISPLACING MEANS IN SAID MASTER CYLINDER TO DISPLACE FLUID TO THE OTHER SET OF WHEEL CYLINDERS, SAID THIRD AND FOURTH FLUID DISPLACING MEANS BEING ADAPTED TO BE OPERATED BY FLUID PRESSURE FROM SAID SECOND FLUID PRESSURE DISPLACING MEANS, AN EXPANSIBLE CHAMBER ADAPTED TO YIELD AT A PREDETERMINED HYDRAULIC PRESSURE TO RECEIVE FLUID FROM SAID FOURTH FLUID PRESSURE DISPLACING MEANS, AND VALVE MEANS TO PROVIDE COMMUNICATION FROM SAID SECOND AND FOURTH FLUID DISPLACING MEANS TO THE FIRST AND SECOND SET OF WHEEL CYLINDERS, RESPECTIVELY, BELOW A PREDETERMINED HYDRAULIC PRESSURE AND TO CLOSE ABOVE SUCH PREDETERMINED PRESSURE, SAID FIRST FLUID DISPLACING MEANS BEING PERMANENTLY CONNECTED TO ONE SET OF WHEEL CYLINDERS AND SAID THIRD FLUID DISPLACING MEANS BEING PERMANENTLY CONNECTED TO THE OTHER SET OF WHEEL CYLINDERS.
Claim 2
Dependent Claim
168 words
IN A HYDRAULIC BRAKING SYSTEM INCLUDING TWO SETS OF WHEEL CYLINDERS TO APPLY THE BRAKES, IN COMBINATION, A MASTER CYLINDER, A FIRST AND SECOND FLUID DISPLACING MEANS THEREIN TO DISPLACE FLUID THEREFROM TO ONE SET OF WHEEL CYLINDERS, A THIRD AND FOURTH FLUID DISPLACING MEANS IN SAID MASTER CYLINDER TO DISPLACE FLUID TO THE OTHER SET OF WHEEL CYLINDERS, SAID THIRD AND FOURTH FLUID DISPLACING MEANS BEING ADAPTED TO BE OPERATED BY FLUID PRESSURE FROM SAID SECOND FLUID PRESSURE DISPLACING MEANS, AN EXPANSIBLE CHAMBER ADAPTED TO YIELD AT A PREDETERMINED HYDRAULIC PRESSURE TO RECEIVE FLUID FROM SAID FOURTH FLUID PRESSURE DISPLACING MEANS, AND VALVE MEANS TO PROVIDE COMMUNICATION FROM SAID SECOND AND FOURTH FLUID DISPLACING MEANS TO THE FIRST AND SECOND SET OF WHEEL CYLINDERS, RESPECTIVELY, BELOW A PREDETERMINED HYDRAULIC PRESSURE AND TO CLOSE ABOVE SUCH PREDETERMINED PRESSURE, SAID FIRST FLUID DISPLACING MEANS BEING PERMANENTLY CONNECTED TO ONE SET OF WHEEL CYLINDERS AND SAID THIRD FLUID DISPLACING MEANS BEING PERMANENTLY CONNECTED TO THE OTHER SET OF WHEEL CYLINDERS.
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) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |