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. 11, 2011
Filed:
Feb. 13, 2009
Applicants:
Keiji Iwata, Tokyo, JP;
Hideyuki Hamamura, Tokyo, JP;
Inventors:
Keiji Iwata, Tokyo, JP;
Hideyuki Hamamura, Tokyo, JP;
Assignee:
Nippon Steel Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/16 (2006.01);
U.S. Cl.
CPC ...
Abstract
A grain-oriented electrical steel plate is characterized in that grooves having a width of 10 μm to 200 μm and a depth of 10 μm to 30 μm exist in at least one of a front surface and a rear surface of a steel plate at intervals of 1 mm to 10 mm, an angle between a direction in which the grooves extend and a rolling direction of the steel plate is 60 degrees to 120 degrees, and tensile stresses having a maximum value of 20 MPa to 300 MPa act in the rolling direction within ranges of 10 μm to 300 μm from side surfaces of the grooves.