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:
Apr. 16, 1991
Filed:
Feb. 15, 1989
Michael J Hawker, Lincoln, GB;
Clayton Dewandre Co., Ltd., Lincoln, GB;
Abstract
A pilot-operated hydraulic control valve for use in conjunction with a solenoid modulator to provide brake pressure modulation on heavier vehicles, particularly in so-called automotive anti-lock systems. The pilot-operated slave unit has an inlet valve operable by travel of one piston and an exhaust valve operable by travel of another piston. One is a main piston which travels in response to pilot signal pressure and during part of its travel controls travel of the other piston, and an auxiliary piston, away from a stopped position towards which the auxiliary piston is biased. Thus, the valve has three distinct and stable positions (supply to delivery, delivery held, and delivery to exhaust), determined by the pilot signal pressure and the effort travel characteristic. It can, therefore, imitate as a slave unit, the pressure modulations of a three-state antilock solenoid valve but with increased fluid flow.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile