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:
Aug. 15, 2006
Filed:
Jan. 07, 2004
Kenichi Sato, Shimotsuga-gun, JP;
Arata Kakiuchi, Shimotsuga-gun, JP;
Teruo Takahashi, Shimotsuga-gun, JP;
Masao Ishida, Wako, JP;
Hiroyuki Oketani, Wako, JP;
Kenichi Sato, Shimotsuga-gun, JP;
Arata Kakiuchi, Shimotsuga-gun, JP;
Teruo Takahashi, Shimotsuga-gun, JP;
Masao Ishida, Wako, JP;
Hiroyuki Oketani, Wako, JP;
Nippon Piston Ring Co., Ltd., Satiama, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A valve seat, press-fitted into a cylinder head of an internal combustion engine, containing an iron-based sintered alloy, includes a valve-seating section and a head-seating section. The valve-seating section and the head-seating section are monolithically formed by a sintering process and form a double layer structure. The valve-seating section includes a first iron-based sintered alloy member that has a porosity of 10 to 25 percent by volume and a sintered density of 6.1 to 7.1 g/cmand contains hard particles dispersed in a matrix. The head-seating section includes a second iron-based sintered alloy member that has a porosity of 10 to 20 percent by volume and a sintered density of 6.4 to 7.1 g/cm.