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, 1976
Filed:
Apr. 02, 1975
Job Werner Hartmann, Ludwigshafen, DT;
Hans-Joerg Hartmann, Freinsheim, DT;
Dieter Mayer, Ludwigshafen, DT;
Peter Felleisen, Lampertheim, DT;
Ursula Klein, Ludwigshafen, DT;
Herbert Motz, Ludwigshafen, DT;
Badische Anilin- & Soda-Fabrik Aktiengesellschaft, Ludwigshafen (Rhine), DT;
Abstract
A magnetic recording medium in the form of a card having a non-magnetic support with a magnetic coating on one side of the support and a backcoating on the opposite side of the support, which backcoating exhibits improved scratch resistance and adherence to the support and improved frictional characteristics and consists essentially of 20 to 50% by weight of a binder mixture containing 10 to 60% by weight of an elastomeric polyurethane and, incorporated in the binder mixture, a non-magnetic pulverulent mixture of 10 to 40% by weight of conductive carbon powder and 60 to 90% by weight of platelet-shaped and spherical particles.