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:
Jan. 26, 2016
Filed:
Mar. 27, 2009
Kae Itoh, Shinjuku-ku, JP;
Katsushi Hamakubo, Shinjuku-ku, JP;
Kae Itoh, Shinjuku-ku, JP;
Katsushi Hamakubo, Shinjuku-ku, JP;
WD Media (Singapore) Pte. Ltd., Singapore, SG;
Abstract
Disclosed is a magnetic disk that has excellent durability, particularly excellent LUL durability, and excellent alumina resistance and has a high level of reliability under a low flying height of a magnetic head involved in a recent tendency toward a rapid increase in recording density and a very severe environment resistance requirement due to diversified applications. A magnetic disk () comprises a substrate () and at least a magnetic layer (), a carbon-based protective layer (), and a lubricating layer () provided in that order over the substrate (). The lubricating layer () contains a compound that has a perfluoropolyether main chain in the structure thereof and has an aromatic group and a polar group at the end of the molecule.