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:
Oct. 22, 1985
Filed:
Oct. 28, 1983
Applicant:
Inventors:
Assignee:
Toray Industries, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428147 ; 360134 ; 428141 ; 428145 ; 428149 ; 428152 ; 428201 ; 428216 ; 428336 ; 428447 ; 428480 ; 428694 ; 428900 ; 428323 ; 428329 ; 428330 ; 428331 ;
Abstract
Disclosed is a polyester film for a magnetic recording medium, which is comprised of a polyester film, a discontinuous film layer or layers adhering closely to one surface or both the surfaces of the polyester film, and fine particles present in the discontinuous film layer or layers and on the or each surface of the discontinuous film layer or layers, or on the exposed surface or surfaces of the polyester film in the portions where the discontinuous film layer or layers are not present. The discontinuous film layer or layers have a thickness of not larger than 500 angstroms and are composed mainly of a water-soluble polymer.