US3415577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle braking systems
Assignee: Harry Ferguson Research Ltd
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Filing: 1967-04-11
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Granted: 1968-12-10
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Expires: 1987-04-11
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:05
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/50; B60T8/5018; B60T8/5025; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/52; B60T8/38; B60T8/44; B60T8/447; B60T8/448; B60T8/72; B60T8/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A VEHICLE HAVING A SERVO-ASSISTED BRAKING SYSTEM, AN ANTI-SKID DEVICE OPERABLE IN RESPONSE TO INERTIA CHANGES, AND VALVE MEANS INTERPOSED IN THE SERVO SYSTEM AND OPERATIVELY CONNECTED TO SAID ANTI-SKID DEVICE WHEREBY ON OPERATION OF THE LATTER SAID VALVE MEANS IS OPERATED TO SEQUENTIALLY REDUCE, REMOVE AND REVERSE THE SERVO-ASSISTANCE TO DECREASE THE BRAKING EFFECT, AND A PRESSURE RESPONSIVE CONTROL VALVE INTERPOSED BETWEEN SAID VALVE MEANS AND SAID SERVO-MECHANISM AND OPERABLE TO CONTROL FLUID FLOW FROM THE LATTER TO THE FORMER SUBSEQUENT TO ANTI-SKID OPERATION, TO THEREBY CONTROL RE-APPLICATION OF THE BRAKES.
Claim 2
Dependent Claim
92 words
A VEHICLE HAVING A SERVO-ASSISTED BRAKING SYSTEM, AN ANTI-SKID DEVICE OPERABLE IN RESPONSE TO INERTIA CHANGES, AND VALVE MEANS INTERPOSED IN THE SERVO SYSTEM AND OPERATIVELY CONNECTED TO SAID ANTI-SKID DEVICE WHEREBY ON OPERATION OF THE LATTER SAID VALVE MEANS IS OPERATED TO SEQUENTIALLY REDUCE, REMOVE AND REVERSE THE SERVO-ASSISTANCE TO DECREASE THE BRAKING EFFECT, AND A PRESSURE RESPONSIVE CONTROL VALVE INTERPOSED BETWEEN SAID VALVE MEANS AND SAID SERVO-MECHANISM AND OPERABLE TO CONTROL FLUID FLOW FROM THE LATTER TO THE FORMER SUBSEQUENT TO ANTI-SKID OPERATION, TO THEREBY CONTROL RE-APPLICATION OF THE BRAKES.
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) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |