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, 2009
Filed:
Jan. 10, 2007
Applicants:
Ken Yoshimura, Ibaraki, JP;
Tetsutaro Inoue, Ibaraki, JP;
Inventors:
Ken Yoshimura, Ibaraki, JP;
Tetsutaro Inoue, Ibaraki, JP;
Assignee:
Hitachi Maxell, Ltd., Ibaraki-shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/708 (2006.01);
U.S. Cl.
CPC ...
Abstract
A magnetic recording medium having a non-magnetic support and a magnetic layer formed thereon, wherein the magnetic layer comprises a ferromagnetic powder, a binder and a non-magnetic inorganic powder, and wherein at least 95% of the non-magnetic powder particles contained in the magnetic layer have a particle size of 0.05 to 0.013 μm, provide that the non-magnetic powder particles are those found in a field of view of 1.8 μm×2.4 μm when the surface of the magnetic layer is observed with a scanning electron microscope at a magnification of 50,000 times.