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:
Oct. 09, 2001
Filed:
Jan. 31, 2000
Kenneth R. LeVey, West Chicago, IL (US);
David R. Nowak, Bloomingdale, IL (US);
Illinois Tool Works Inc., Glenview, IL (US);
Abstract
The check valve has rotationally symmetric outer boundaries with a transverse plate separating a first portion which is intended to be within a first air space and a second portion which is intended to be within a second air space. Two internal passageways are formed within the interior of the check valve, each with an opening in the first portion and another opening in the second portion. The first and second portions each include a circular channel with flared walls into which one of the openings is formed. Each circular channel includes an O-ring which serves as a valve to control flow into the respective internal passageway.