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:
Jan. 21, 1992
Filed:
Aug. 23, 1990
Ludwig Kreitner, Heppenheim, DE;
Werner Grau, Bobenheim-Roxheim, DE;
August Lehner, Roedersheim-Gronau, DE;
Hans Reichert, Oberkirch, DE;
Friedrich Sommermann, Kehl, DE;
Norbert Schneider, Altrip, DE;
Gerd Erhardt, Kehl, DE;
Basf Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Magnetic recording media are produced by preparing a dispersion of anisotropic magnetic materials in solution in an organic binder using dispersants and further conventional additives, applying the dispersion in the form of a layer onto a nonmagnetic substrate and solidifying the applied magnetic layer, by a process in which a cylindrical grinding chamber is used which is provided with an anchor stirrer or helical stirrer and contains grinding media whose specific gravity is lower than that of the magnetic material.