US3672729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle braking systems
Assignee: Girling Ltd
•
Filing: 1970-10-15
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Granted: 1972-06-27
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Expires: 1990-10-15
Abstract
Abstract A VEHICLE HYDRAULIC BRAKE SYSTEM HAS SEPARATE PRESSURE SOURCES AND SEPARATE SERVICE AN EMERGENCY BRAKE CONTROL MEANS FOR SUPPLYING PRESSURE FROM THOSE SOURCES TO THE INDIVIDUAL WHEEL CYLINDER, AS WELL AS LOCK UNITS AND A MANUAL CONTROL FOR OPERATING THE SAME. PRESSURE LINES LEADING FROM THE SERVICE AND EMERGENCY BRAKE CONTROL ARE BRANCHED INTO EACH OTHER BY MEANS FOR CHANGEOVER VALVES ACTING AS DOUBLE CHECK VALVES SO THAT ANY INDIVIDUAL WHEEL CYLINDER CHAMBER CAN RECEIVE PRESSURE FROM A SOURCE UNDER THE CONTROL OF EITHER THE SERVICE CONTROL OR THE EMERGENCY CONTROL, WITHOUT UNNECESSARY DUPLICATION OF PIPEWORK OR OF WHEEL CYLINDERS.
Inventors
- 👤 Roy Blakey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:01
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/108; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/141
Claims Analysis
Total Claims: 0
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |