US3401982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle braking systems
Assignee: Harry Ferguson Research Ltd
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Filing: 1965-05-11
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Granted: 1968-09-17
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Expires: 1985-05-11
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Walker
- 👤 William H Bent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:07
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/142; B60T13/143; B60T13/16; B60T13/161; B60T13/162; B60T13/24; B60T13/241; B60T8/00; B60T8/32; B60T8/321; B60T8/322
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A BRAKING SYSTEM INCLUDING WHEEL BRAKES, MANUAL MEANS CONNECTED TO SAID BRAKES FOR MANUALLY APPLYING SAID BRAKES, A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE, AND A SERVO-MECHANISM CONNECTED TO SAID SOURCE INTERPOSED BETWEEN SAID BRAKES AND SAID MANUAL MEANS FOR POWER APPLICATION OF THE BRAKES, SAID SERVO-MECHANISM INCLUDING SERVO VALVE MEANS MOVABLE BY SAID MANUAL MEANS FOR POSITIONING THE BRAKES ARE INTO FIRST AND SECOND POSITIONS IN WHICH THE BRAKES ARE RESPECTIVELY RELEASED AND APPLIED BY SAID SERVO-MECHANISM, SAID SERVO-MECHANISM ALSO INCLUDING FIRST AND SECOND REACTION AREAS CONNECTED IN LOST MOTION RELATIONSHIP WITH SAID SERVO VALVE MEANS AND IN COMMUNICATION WITH SAID SOURCE, THE ARRANGEMENT BEING SUCH THAT SAID FIRST REACTION AREA RESISTS MOVEMENT OF SAID SERVO VALVE MEANS FROM SAID FIRST INTO SAID SECOND POSITION, AND SAID SECOND REACTION AREA RESISTS MOVEMENT OF SAID SERVO VALVE MEANS BEYOND SAID SECOND POSITION DURING NORMAL BRAKING OF A VEHICLE IN WHICH THE BRAKING SYSTEM IS INCORPORATED.
Claim 2
Dependent Claim
155 words
A BRAKING SYSTEM INCLUDING WHEEL BRAKES, MANUAL MEANS CONNECTED TO SAID BRAKES FOR MANUALLY APPLYING SAID BRAKES, A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE, AND A SERVO-MECHANISM CONNECTED TO SAID SOURCE INTERPOSED BETWEEN SAID BRAKES AND SAID MANUAL MEANS FOR POWER APPLICATION OF THE BRAKES, SAID SERVO-MECHANISM INCLUDING SERVO VALVE MEANS MOVABLE BY SAID MANUAL MEANS FOR POSITIONING THE BRAKES ARE INTO FIRST AND SECOND POSITIONS IN WHICH THE BRAKES ARE RESPECTIVELY RELEASED AND APPLIED BY SAID SERVO-MECHANISM, SAID SERVO-MECHANISM ALSO INCLUDING FIRST AND SECOND REACTION AREAS CONNECTED IN LOST MOTION RELATIONSHIP WITH SAID SERVO VALVE MEANS AND IN COMMUNICATION WITH SAID SOURCE, THE ARRANGEMENT BEING SUCH THAT SAID FIRST REACTION AREA RESISTS MOVEMENT OF SAID SERVO VALVE MEANS FROM SAID FIRST INTO SAID SECOND POSITION, AND SAID SECOND REACTION AREA RESISTS MOVEMENT OF SAID SERVO VALVE MEANS BEYOND SAID SECOND POSITION DURING NORMAL BRAKING OF A VEHICLE IN WHICH THE BRAKING SYSTEM IS INCORPORATED.
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) | 1971-09-17 | 1972-03-18 | 1972-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-17 | 1976-03-18 | 1976-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-17 | 1980-03-18 | 1980-09-17 | $7700.00 | Window Closed / Lapsed |