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. 22, 2004
Filed:
Dec. 22, 2000
Applicant:
Inventors:
Kenichi Nakata, Ohtake, JP;
Kousaku Tamari, Hiroshima, JP;
Jun Koujima, Hiroshima-ken, JP;
Teruaki Santoki, Ohtake, JP;
Assignee:
Toda Kogyo Corporation, Hiroshima-ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/62 ; H01F 1/012 ; H01F 1/014 ;
U.S. Cl.
CPC ...
G11B 5/62 ; H01F 1/012 ; H01F 1/014 ;
Abstract
A magnetic recording medium including a substrate and formed on the substrate a maghemite thin film having a surface roughness represented by a center line mean roughness Ra of 0.1 to 1.0 nm, and a coercive force squareness S* value of not less than 0.50. This magnetic recording medium exhibits excellent magnetic properties, especially, coercive force squareness S* value and a more enhanced surface smoothness.