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:
Jul. 29, 1986
Filed:
Oct. 16, 1985
Hiromichi Koshiishi, Tokyo, JP;
Sigeki Eguchi, Kitakyushu, JP;
Hisahumi Sakamoto, Kitakyushu, JP;
Hisayoshi Kuramasu, Kitakyushu, JP;
Nippon Steel Corporation, Tokyo, JP;
Mitsui High Tech, Inc., Tokyo, JP;
Abstract
The present invention relates to a method for annealing a core blank of a transformer or the like so as to relieve the stress generated in the electrical steel sheet sections due to blanking. The present invention is an improvement over the conventional resistance or gas-heating method in the light of heating efficiency and time and is characterized by induction-heating a core blank at a power input range of from 0.5 to 3 kW/kg of the core blank. This range attains a small variation in the shape of a core blank due to induction-heating.