Patent US3233233A successfully refreshed from Google Patents.
Patent US3704045A successfully refreshed from Google Patents.
US3704045A
Expired / Lapsed
US
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Fluidically controlled antiskid vehicle brake system
Assignee: AT&T Inc
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Filing: 1969-11-14
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Granted: 1972-11-28
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Expires: 1989-11-14
Abstract
Abstract An improved fluid actuated vehicle braking system is disclosed that combines continuous braking action of the vehicle with intermittent braking at the vehicle wheels. Insertion of a fluidic flip-flop between the master cylinder and the wheel cylinders permits alternate application of the front and rear brakes. Depression of the brake pedal results in continuous deceleration of the vehicle since one or the other brake is continuously operated. At the same time, the possibility of the vehicle skidding is minimized by the intermittent braking action at each wheel which prevents ''''locking'''' of any wheel.
Inventors
- 👤 Edward G Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:05
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T8/00; B60T8/32; B60T8/321; B60T8/3295; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/218; Y10T137/2202; Y10T137/2229; Y10T137/224
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A brake system for a vehicle having front and rear brakes actuated by pressurized fluid comprising a fluidic flip-flop having an inlet and a plurality of selectively energizable outputs, a first output being connected to the front brake and a second output being connected to the rear brake, and having a plurality of signal ports for controlling the outputs, means for supplying pressurizing fluid to the inlet of the flipflop, control means for alternately energizing the first and second outputs to alternately actuated the front and rear brakes of the vehicle, a resilient fluid reservoir, and means connected to the first and second outputs for limiting the quantity of pressurized fluid supplied by the first and second outputs to the front and rear brakes respectively and for diverting fluid in excess of the limit from the brakes to the fluid reservoir.
Claim 2
Dependent Claim
141 words
A brake system for a vehicle having front and rear brakes actuated by pressurized fluid comprising a fluidic flip-flop having an inlet and a plurality of selectively energizable outputs, a first output being connected to the front brake and a second output being connected to the rear brake, and having a plurality of signal ports for controlling the outputs, means for supplying pressurizing fluid to the inlet of the flipflop, control means for alternately energizing the first and second outputs to alternately actuated the front and rear brakes of the vehicle, a resilient fluid reservoir, and means connected to the first and second outputs for limiting the quantity of pressurized fluid supplied by the first and second outputs to the front and rear brakes respectively and for diverting fluid in excess of the limit from the brakes to the fluid reservoir.
References Cited (Backward Citations)
US2959012A
Cited
US3185166A
Cited
US3270932A
Cited
US3361487A
Cited
US3404923A
Cited
US3466098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |