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:
Jul. 09, 1991
Filed:
Oct. 31, 1989
Applicant:
Inventors:
Michael W Mueller, Plankstadt, DE;
Ekkehard Schwab, Neustadt, DE;
Helmut Auweter, Limburgerhof, DE;
Rainer Feser, Gruenstadt, DE;
Rudi Lehnert, Ludwigshafen, DE;
Norbert Mueller, Friedelsheim, DE;
Manfred Ohlinger, Frankenthal, DE;
Assignee:
BASF, Ludwigshafen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01G / ;
U.S. Cl.
CPC ...
252 6255 ; 252 6251 ; 252 6256 ; 423607 ;
Abstract
An acicular, ferromagnetic material which has a high coercive force and essentially consists of iron-containing chromium dioxide is prepared by thermal decomposition of hydrated chromium(III) chromate under superatmospheric pressure.