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:
Apr. 22, 2014
Filed:
Jul. 05, 2012
Kaori Kimura, Yokohama, JP;
Kazutaka Takizawa, Fuchu, JP;
Masatoshi Sakurai, Tokyo, JP;
Akihiko Takeo, Kunitachi, JP;
Kaori Kimura, Yokohama, JP;
Kazutaka Takizawa, Fuchu, JP;
Masatoshi Sakurai, Tokyo, JP;
Akihiko Takeo, Kunitachi, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A manufacturing method of a magnetic recording medium according to one embodiment includes forming a mask layer having a pattern regularly arranged in a longitudinal direction on a magnetic recording medium containing a substrate and a magnetic recording layer, forming a recording portion having a magnetic pattern and a non-recording portion by patterning the magnetic recording layer, and submitting the mask layer to a peeling liquid to peel the mask layer. The mask layer contains a lamination layer of a lift-off layer, a first hard mask, and a second hard mask. The second hard mask is formed of a material that is different from the material of the first hard disk and the material is dissolvable in the same peeling liquid as the peeling liquid that dissolves the lift-off layer.