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:
Nov. 16, 2004
Filed:
May. 16, 2003
Masatoshi Takahashi, Kanagawa, JP;
Hiroaki Doushita, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A magnetic recording medium containing: a support; and a magnetic layer containing a ferromagnetic powder and a binder, wherein the magnetic layer has 100 or less protrusions per 900 &mgr;m on a surface thereof, the protrusion having a height, as measured by AFM, of 30 nm or more, the magnetic layer has a magnetic switching volume of from 0.1×10 to 5×10 mL, the magnetic layer has a coercive force of 2,000 Oe (159.2 KA/m) or more, and a surface of the support, the surface being opposed to the magnetic layer, has a PSD in a machine direction, as measured by an interferometric roughness tester with a magnification of 5 times, of from 500 to 4,000 &mgr;m at a space wavelength of 10 &mgr;m, and a reproduction process containing reproducing the magnetic recording medium by an MR head.