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:
Jun. 26, 2012
Filed:
Feb. 23, 2010
Kenichiro Kawamura, Kyoto, JP;
Masayuki Miyamoto, Kyoto, JP;
Takahiro Yamaguchi, Omihachiman, JP;
Hidekazu Sasai, Moriyama, JP;
Kenichiro Kawamura, Kyoto, JP;
Masayuki Miyamoto, Kyoto, JP;
Takahiro Yamaguchi, Omihachiman, JP;
Hidekazu Sasai, Moriyama, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A check valve is housed in a valve chamber and includes a support portion and a flexible portion. The support portion extends along a principal axis thereof. The flexible portion is supported by the support portion in a manner extending from the principal axis. A diaphragm defines a lower wall of the valve chamber, and includes an inflow port for fluid at a position that is closed with the flexible portion when the flexible portion is displaced. A bottom plate defines an upper wall of the valve chamber, and faces the diaphragm with the flexible portion arranged therebetween. An uneven portion is provided in at least one of mutually facing areas of an upper principal surface, which is one of two principal surfaces of the flexible portion and faces the bottom plate, and a lower principal surface of the bottom plate, the uneven portion being partially uneven.