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:
Dec. 03, 1991
Filed:
Jan. 26, 1989
Applicant:
Inventors:
Osamu Saito, Takatsuki, JP;
Kenji Sumiya, Suita, JP;
Assignee:
Hitachi Maxell, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428421 ; 428422 ; 428694 ; 428695 ; 428900 ;
Abstract
A magnetic recording medium comprising a substrate, a magnetic layer formed on at least one surface of the substrate and a lubricant, which is present on or in the magnetic layer and comprises at least one of fluorine-containing solid compound of the formulae: ##STR1## wherein X is a divalent group not containing fluorine, Y is a hydrophilic group or a monovalent group having a terminal carbon-carbon double bond, Z is a hydrogen atom or a metal atom, n is an integer of 3 or more, m is 0 or 1, and p is 2 or 3, which has a small coefficient of friction on the surface, improved durability and running stability.