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:
Oct. 29, 1996
Filed:
Nov. 16, 1994
Harald Jachow, Worms, DE;
Reinhard K orner, Frankenthal, DE;
Ronald J Veitch, Maxdorf, DE;
Ekkehard Schwab, Neustadt, DE;
Helmut Jakusch, Frankenthal, DE;
Bernd H oppner, Neustadt, DE;
Rudi Lehnert, Ludwigshafen, DE;
Manfred Ohlinger, Frankenthal, DE;
BASF Magnetics GmbH, Mannheim, DE;
Abstract
A finely divided acicular CrO.sub.2 modified with iron, tellurium and/or antimony and having a high coercive force possesses improved heat stability of the residual induction and a relatively narrow distribution of the particle size and of the coercive force. This CrO.sub.2 pigment is obtained by a method in which the iron compound used for the modification is iron oxalate, which is employed in an amount of 1-10% by weight, based on the theoretical CrO.sub.2 yield.