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. 27, 2009
Filed:
Sep. 09, 2005
Wataru O-hashi, Futtu, JP;
Masafumi Miyazaki, Futtu, JP;
Yousuke Kurosaki, Futtu, JP;
Takeshi Kubota, Futtu, JP;
Wataru O-hashi, Futtu, JP;
Masafumi Miyazaki, Futtu, JP;
Yousuke Kurosaki, Futtu, JP;
Takeshi Kubota, Futtu, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
A nonoriented electrical steel sheet excellent in core loss comprising copper sulfides with a sphere-equivalent radius of 100 nm or less, wherein the number density of the copper sulfides is less than 1×10[inclusions/mm]. Preferably, the percentage of the number of copper sulfides with a (major axis)/(minor axis) ratio of more than 2 per total number of copper sulfides is 30% or less. The steel preferably further comprises Cu of 0.5 mass % or less and REM of 0.0005% or more and 0.03% or less, wherein the following expression (1) or expressions (1) and (2) are met:[REM]×[Cu]≧7.5×10  (1),([REM]−0.003)×[Cu]≦1.25×10  (2).