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:
Apr. 09, 1996
Filed:
Sep. 28, 1994
Uwe Arndt, Aires, AR;
Michael Batz, Leichlingen, DE;
Rainer Bellinghausen, Koln, DE;
Hans-Dieter Block, Leverkusen, DE;
Heinrich Helker, Krefeld, DE;
Norbert Lonhoff, Leverkusen, DE;
Hans-Heinrich Moretto, Leverkusen, DE;
Hans-Georg Nieder-Vahrenholz, Pulheim, DE;
Hans Rinkes, Koln, DE;
Bernhard Spreckelmeyer, Leverkusen, DE;
Rainer Weber, Odenthal, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
A method for manufacturing alkali chromates by the reacting of chromium ore with alkali compounds and oxidation in an atmosphere containing at least 50% oxygen is described, in which the mixture consisting of chromium ore, alkali compound and optionally leaning materials is heated in a first stage in an atmosphere containing not more than 5 vol. % oxygen to a temperature between 1000.degree. and 1 400.degree. C., and in a second stage is oxidized at a lower temperature of 900.degree. to 1 070.degree. C. with supply of an atmosphere containing at least 50% oxygen.