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. 24, 1979
Filed:
Jul. 15, 1977
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Toyota Jidosha Kogyo Kabushiki Kaisha, Toyota, JP;
Abstract
A pressure control valve assembly comprising a rubber diaphragm to which is applied the negative pressure of the engine intake manifold and the exhaust gas pressure of the engine exhaust manifold. The diaphragm of the present invention is formed with a gradual descent sloping down from a valve-actuating central portion to an outer periphery. Adjacent to one portion of the outer periphery of the diaphragm a port opening to the outside of the valve assembly is provided. Thus, any gas ingredients such as condensed water can be expelled along the descent of the diaphragm via the port without gathering on the diaphragm surface which will therefore be free from objectionable oxidation or corrosion.