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:
Sep. 06, 2005
Filed:
Mar. 12, 2003
Koichi Abe, Saitama, JP;
Koichi Abe, Saitama, JP;
Surpass Industry Co., Ltd., Saitama, JP;
Abstract
A check valve comprises: a pair of cylindrical body elements () through which a fluid passes; a cylindrical valve element (), which is disposed inside an upstream-side one () of the cylindrical body elements (), constantly subjected to a fluid pressure and biased toward its closed position under the influence of a resilient force exerted by a compression coil spring () coated with a tubular element; and, a stopper element () disposed in a downstream-side one () of the cylindrical body elements (). The check valve is characterized in that at least one of the cylindrical valve element () and the stopper element () is provided with a spiral seat portion () an axial spiral surface of which is brought into stable surface-contact with the compression coil spring () to support the compression coil spring () therein.