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:
Mar. 07, 2000
Filed:
Feb. 13, 1998
Shigeaki Wakana, Tochigi-ken, JP;
Tadashi Ito, Tochigi-ken, JP;
Kao Corporation, Tokyo, JP;
Abstract
A magnetic recording medium having a nonmagnetic substrate, an intermediate layer containing at least a nonmagnetic powder, and a magnetic layer containing a ferromagnetic powder and a binder, wherein the magnetic layer has an indentation hardness of 0.3 GPa or more, and the surface profile of the magnetic layer satisfies the following conditions (a) to (c): (a) the 10 point height parameter R.sub.Z is 100 nm or less; (b) the difference between the maximum peak-to-valley distance PV and R.sub.Z (PV-R.sub.Z) is 10 nm or less; and (c) the skewness Rsk is -2 or more and less than 0, has excellent electromagnetic conversion characteristics and running durability.