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:
Jul. 04, 2000
Filed:
Jun. 25, 1998
Applicant:
Inventors:
Teruo Takahashi, Shimotsuga-gun, JP;
Toshiaki Sato, Shimotsuga-gun, JP;
Assignee:
Nippon Piston Ring Co., Ltd., Tokyo-to, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01L / ;
U.S. Cl.
CPC ...
1231888 ; 1231883 ;
Abstract
A valve seat for an internal combustion engine is provided with a base member in which cobalt-based hard particles are dispersed in a matrix of an iron-based alloy. The matrix of an iron-based alloy comprises (a) carbon in a range of 0.5-1.5 weight %, (b) chromium and/or vanadium in a range of 0.5-10.0 weight % in total and (c) iron as a remainder based on weight of the base member respectively. An amount of the cobalt-based hard particles is in a range of 26-50 weight % based on weight of the base member.