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. 30, 1993
Filed:
Dec. 11, 1991
Applicant:
Inventors:
Uwe Keppeler, Ludwigshafen, DE;
Michael Bobrich, Boehl-Iggelheim, DE;
Helmut Auweter, Limburgerhof, DE;
Rudolf Suettinger, Heidelberg, DE;
Albert Kohl, Laumersheim, DE;
Hermann Dikow, Hockenheim, DE;
Werner Lenz, Bad Duerkheim, DE;
Gregor Brodt, Heppenheim, DE;
Assignee:
BASF Magnetics GmbH, Mannheim, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; G11B / ;
U.S. Cl.
CPC ...
4284259 ; 252 6254 ; 428694 ; 428900 ;
Abstract
In magnetic recording media consisting of a nonmagnetic substrate and one or more magnetizable layers bonded thereon and based on a polyurethane binder, the binder consists of not less than 50% by weight of an isocyanate-free, branched polyurethane which is soluble in tetrahydrofuran and has sulfonate groups along the polyurethane branches and OH-containing urea groups at the chain ends and a molecular weight of from 4,000 to 30,000.