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. 16, 1990
Filed:
Jul. 17, 1989
Applicant:
Inventors:
Ujihiro Nishiike, Chiba, JP;
Yasuhiro Kobayashi, Chiba, JP;
Hirotake Ishitobi, Chiba, JP;
Shigeko Sujita, Chiba, JP;
Norio Takahashi, Chiba, JP;
Hisanao Nakahara, Chiba, JP;
Yukio Inokuti, Chiba, JP;
Assignee:
Kawasaki Steel Corp., , US;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
148111 ;
Abstract
A grain oriented electromagnetic steel sheet having a very low iron loss is obtained by subjecting a surface of base metal in the sheet after finish annealing to a particular mechanical polishing and has a surface roughness having a center-line average roughness of not more than 0.3 .mu.m after the polishing and the number of abrasive grains embedded in a layer just beneath polished surface of not more than 20,000 grains/cm.sup.2.