Multiple-circuit hydraulic brake system
Patent 4482190 Issued on November 13, 1984. Estimated Expiration Date: 
September 20, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 20, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3502181 3800538 Dual-circuit brake system Master cylinder assemblies for vehicle hydraulic braking systems Patent #: 3979153 InventorsApplicationNo. 06/419882 filed on 09/20/1982US Classes:303/9.63, Failure responsive188/345, With multiple master cylinders303/114.1Including hydraulic power boosterExaminersPrimary: Butler, Douglas C.Attorney, Agent or FirmInternational ClassB60T 8/26 (20060101)Foreign Application Priority Data1981-12-18 DEAbstractThe multiple-circuit hydraulic brake system includes a brake-actuating device having three working chambers for actuating wheel brake cylinders. A first brake circuit is connected to a first of the three working chambers and separately to each wheel brake cylinder of the rear axle through a different one of two control valves controlled by the pressure of a second and a third of the three working chambers. A second brake circuit is connected between one of the wheel brake cylinders of the front axle and the second of the three working chambers and a third brake circuit is connected between the other of the wheel brake cylinders of the front axle and the third of the three working chambers. Upon failure of the second and/or third brake circuit, the associated one of the two control valves retain the pressure of the diagonally opposite rear axle wheel brake cylinder below the wheel locking limit.Other References
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