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:
Aug. 24, 2004
Filed:
Oct. 31, 2001
Masakazu Tani, Nagaokakyo, JP;
Yoshiyuki Makita, Kyoto-fu, JP;
Norihisa Yoshimoto, Kyoto-fu, JP;
Kenichiro Yoshida, Toyonaka, JP;
Hitachi Maxell, Ltd., Osaka, JP;
Abstract
A magnetic recording medium comprising a non-magnetic support, at least one primer layer formed on one surface of the non-magnetic support, a magnetic layer formed on the primer layer, and a backcoat layer formed on the other surface of the non-magnetic support, wherein the magnetic layer has a thickness of 0.30 &mgr;m or less and a centerline average surface roughness Ra of 3.2 nm or less, and (P −P ) is 30 nm or less and (P −P ) is 5 nm or less in which P is an averaged height of projections of the magnetic layer, and P , P , - - - and P are heights of the highest, the second highest, - - - and the 20th highest projections of the magnetic layer, respectively.