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. 10, 1990
Filed:
Mar. 03, 1989
Applicant:
Inventor:
Akio Takayama, Ibaraki, JP;
Assignee:
Kyosan Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
137514 ; 13754315 ;
Abstract
A check valve comprises a frustoconical projection extending upwardly from a bottom surface of the valve body within a valve chamber and an elastic member provided with a plurality of elastic pieces extending downwardly from the valve for sliding on an outer surface of the frustoconical projection in the manner to bring into contact with the outer surface of the frustoconical projection, whereby the check valve characteristic is normally kept stable.