US3561213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual ratio master cylinder
Assignee: Borg Warner Corp
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Filing: 1969-06-27
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Granted: 1971-02-09
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Expires: 1989-06-27
Abstract
Abstract A DUAL RATIO MASTER CYLINDER ADAPTED TO BE CONNECTED TO A HYDRAULIC BRAKING SYSTEM, THE MASTER CYLINDER INCLUDING A PAIR OF PISTONS OF DIFFERENT DIAMETER OPERABLE WITHIN A BORE AND MEANS DISPOSED BETWEEN THE PISTON ADAPTED TO EXERT A FORCE TO RESIST A COMPRESSIVE FORCE UP TO A PREDETERMINED VALUE SUCH THAT UPON ACTIVATION OF THE MASTER CYLINDER, ALL "PLAY" IN THE SYSTEM IS REMOVED IN A LOW PRESSURE HIGH VOLUME OPERATION UNTIL A PREDETERMINED PRESSURE IS BUILT UP WITHIN THE SYSTEM AT WHICH TIME A SECONDARY HYDRAULIC BOOSTER ACTS TO BUILD UP ADDITIONAL PRESSURE IN A HIGHER PRESSURE LOWER VOLUME PHASE OF OPERATION.
Inventors
- 👤 Samuel Shiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:03
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/16; B60T11/224; B60T11/20
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |