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. 14, 2015
Filed:
Mar. 27, 2009
Katsushi Hamakubo, Shinjuku-ku, JP;
Kae Itoh, Shinjuku-ku, JP;
Katsushi Hamakubo, Shinjuku-ku, JP;
Kae Itoh, Shinjuku-ku, JP;
WD Media, LLC, Irvine, CA (US);
Abstract
Provided is a magnetic disk that is excellent in durability, particularly in LUL durability and CFT properties, and thus has high reliability despite the low flying height of a magnetic head following the rapid increase in recording density in recent years and despite the very strict environmental resistance following the diversification of applications. A magnetic disk () has at least a magnetic layer (), a carbon-based protective layer (), and a lubricating layer () provided in this order over a substrate (). The lubricating layer () contains a compound having a perfluoropolyether main chain in a structure thereof and having a polar group other than at ends of a molecule thereof.