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. 04, 1979
Filed:
May. 20, 1977
Eduard Schoenafinger, Ludwigshafen, DE;
Paul Deigner, Weisenheim, DE;
Eberhard Koester, Frankenthal, DE;
Manfred Ohlinger, Frankenthal, DE;
Dieter Schaefer, Ludwigshafen, DE;
Werner Stumpfi, Ludwigshafen, DE;
Juergen Amort, Troisdorf, DE;
Claus-Dietrich Seiler, Rheinfelden, DE;
Heinz Nestler, Troisdorf, DE;
Otto Ambros, Mannheim, DE;
BASF Aktiengesellschaft, , DE;
Abstract
Chromium dioxide magnetic pigments can be stabilized against the loss of their magnetic properties by treating them, in alcoholic aqueous suspension, with a silane or a hydrolysis product thereof, so that when the pigment is isolated from the suspension medium the particles bear at least partially hydrolyzed silane on their surfaces, and then drying the magnetic pigment at from 50.degree. to 200.degree. C.