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. 09, 1992
Filed:
Aug. 23, 1990
Michael Bobrich, Boehl-Iggelheim, DE;
August Lehner, Roedersheim-Gronau, DE;
Albert Kohl, Laumersheim, DE;
Rudolf Suettinger, Heidelberg, DE;
Uwe Keppeler, Ludwigshafen, DE;
Werner Lenz, Bad Duerkheim, DE;
Hermann Roller, Ludwigshafen, DE;
Helmut Kopke, Weisenheim, DE;
Guenther Schulz, Bad Duerkheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Magnetic recording media consist of a nonmagnetic substrate and at least one magnetizable layer which is firmly applied thereon and is based on a polyurethane binder which may be crosslinked with a polyisocyanate, not less than 50% by weight of the binder consisting of a low molecular weight branched polyurethane having OH-containing urea groups at the chain ends, and the frictional properties of the binder being improved and its friction reduced by the incorporation of perfluoro groups.