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:
Mar. 09, 2010
Filed:
Feb. 06, 2006
Kenji Ichikawa, Odawara, JP;
Shiho Kamisawa, Odawara, JP;
Seiji Kasahara, Odawara, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
The present invention provides a magnetic transfer master disk comprising: a master substrate formed by a metal plate, on a surface of which a protruding and recessed pattern corresponding to transfer information is transferred by electroforming, the metal plate being composed of two or more electroforming layers that are different from each other in crystal orientation; and a magnetic layer formed on the protruding and recessed pattern of the master substrate in order to eliminate warpage and distortion of the master disk even if the close contact pressure is increased during transferring magnetic information such as format information to a magnetic disk used in a hard disk device and the like.