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. 20, 1999
Filed:
Nov. 23, 1993
Applicant:
Inventors:
Yuzo Murayama, Yonezawa, JP;
Naohiko Ishimaru, Yonezawa, JP;
Assignee:
AG Technology Co., Ltd., Yokohama, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360135 ;
Abstract
A magnetic disk comprises a glass substrate and a magnetic layer formed on the glass substrate wherein the maximum deflection of a bent portion in the radial direction of the magnetic disk with respect to a reference length of 2 mm is 1,500 .ANG. or less in the entire region of a surface of the disk excluding annular areas having a width of 250 .mu.m which are respectively formed inwardly from annular lines at which chamfered portions formed at the inner and outer peripheries of the magnetic disk and the disk surface intersect.