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:
Feb. 16, 1999
Filed:
Aug. 25, 1997
Keisuke Fukumizu, Tokyo, JP;
Hiroaki Kato, Tokyo, JP;
Teruo Takeuchi, Tokyo, JP;
Takahide Shimazu, Himeji, JP;
Yasuo Sato, Himeji, JP;
Tatsuo Amaike, Tokyo, JP;
Ryoichi Yoshihara, Himeji, JP;
Takeshi Harada, Himeji, JP;
Nippon Steel Corporation, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A 0.1 to 0.5 mm-thick plated steel sheet having high coercive force and magnetic flux density is provided by hot rolling a slab comprising by weight carbon: 0.01 to 0.09%, silicon: not more than 1.0%, phosphorus: not more than 0.3%, manganese: not more than 1.5%, sulfur: not more than 0.04%, aluminum: not more than 1.0%, and nitrogen: not more than 0.01% with the balance consisting of iron and unavoidable impurities, cold rolling the hot rolled sheet, annealing the cold rolled sheet to prepare a steel sheet having an average grain diameter of 3 to 15 .mu.m, temper rolling the steel sheet with a reduction ratio of not more than 3%, and plating the temper rolled sheet with chromium or nickel. This enables the provision of a magnetic shielding material having no significant drift and very good electron beam landing properties.