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. 31, 1989
Filed:
May. 12, 1988
Kamimura Toshio, Gifu, JP;
Ito Koji, Gifu, JP;
Teijin Seiki Co., Ltd., Osaka, JP;
Abstract
A check valve comprises a plurality of poppets and a plurality of springs for urging the poppets, and the poppets and the springs are coaxially disposed. More specifically, the check valve comprises a case, an outer poppet slidably and sealingly inserted into the case, a first spring disposed between the case and the outer poppet for urging the outer poppet, an inner poppet slidably and sealingly inserted into the outer poppet, and a second spring disposed between the inner poppet and the outer poppet for urging the inner poppet. A check valve is free from clogging of contaminations under the contaminated environments. The check valve can stop flow of fluid when the seat surface or spring is damaged or broken.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile