The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 17, 1978
Filed:
Aug. 05, 1976
Roger E Doerfler, Detroit, MI (US);
Gary A Willi, Taylor, MI (US);
Kelsey-Hayes Co., Romulus, MI (US);
Abstract
A dual hydraulic brake system incorporating a dual master cylinder for separately pressurizing the front and rear brakes of a vehicle. A device for varying the proportion of brake pressure applied to the front and rear brakes of a vehicle is positioned between the master cylinder and the front and rear brakes. The device includes a differential area piston for decreasing the proportion of brake pressure delivered to the rear brakes above a first preselected inlet pressure. Positioned within the differential area piston is a second valve assembly which is actuated in response to attainment of a second preselected brake pressure and which blends back the pressure in the rear brake system until it attains the pressure in the front brake system.