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. 24, 1991
Filed:
Dec. 12, 1989
August Lehner, Roedersheim-Gronau, DE;
Rudolf Suettinger, Heidelberg, DE;
Michael Bobrich, Boehl-Iggelheim, DE;
Hermann Dikow, Hockenheim, DE;
Hermann Roller, Ludwigshafen, DE;
Werner Lenz, Bad Durkheim, DE;
Ludwig Kreitner, Heppenheim, DE;
Werner Loch, Erpolzheim, DE;
Norbert Schneider, Altrip, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Magnetic recording media consist of a nonmagnetic substrate and one or more magnetizable layers which are firmly applied thereon and are based on a magnetic material which is finely dispersed in a polymer binder and further conventional additives and essentially consists of ferromagnetic chromium dioxide, and the said recording media are particularly stable to the chemical decomposition due to moisture and oxidizable compounds and hence to deterioration in the magnetic properties, owing to the addition of from 0.1 to 8% by weight of an organic compound from the group consisting of the antioxidants, based on the amount of chromium dioxide, to the magnetic layer.