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:
Jun. 13, 1989
Filed:
Apr. 13, 1988
Yuji Tsukamoto, Tokyo, JP;
NEC Corporation, , JP;
Abstract
In a magnetic recording medium such as a magnetic disk, a protective coating excellent in both mechanical durability and corrosion resistance is provided on a layer of a magnetic recording material, which may be a metal film, by jointly using graphite fluoride and an inorganic nonmetallic hard compound which can be selected from oxides such as SiO.sub.2 and Al.sub.2 O.sub.3, nitrides such as SiN and AlN and carbides such as SiC and WC. The protective coating may be either a single layer of a mixture of graphite fluoride and a hard compound formed by co-sputter deposition or a two-layer coating made up of an inner layer of a hard compound and an outer layer of sputter deposited graphite fluoride.