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. 04, 2005
Filed:
Feb. 24, 2003
Yoshio Koyama, Kani, JP;
Yoshio Koyama, Kani, JP;
Teikoku Piston Ring Co., Ltd., Tokyo, JP;
Abstract
A sintered alloy for valve seats is comprised of carbon at 1 to 2 percent by weight, chromium at 3.5 to 4.7 percent by weight, molybdenum at 4.5 to 6.5 percent by weight, tungsten at 5.2 to 7.0 percent by weight, vanadium at 1.5 to 3.2 percent by weight, and the remainder of iron and unavoidable impurities. Enstatite particles at 1 to 3 percent by weight, hard alloy particles (A) with a Vickers hardness of 500 to 900 at 15 to 25 percent by weight, and hard alloy particles (B) with a Vickers hardness of 1000 or more at 5 to 15 percent by weight (A+B=35 percent by weight or less) are dispersed in the matrix of the sintered alloy skeleton distributed with carbide. Copper or copper alloy at 15 to 20 percent by weight is infiltrated into pores of the skeleton.