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. 25, 1994
Filed:
Aug. 13, 1992
Klaus Borho, Mutterstadt, DE;
Zafirios Grammatis, Mutterstadt, DE;
Karl-Heinz Hennicke, Bad Duerkheim, DE;
Wolfgang Mach, Hockenheim, DE;
Karl Mayer, Lambsheim, DE;
Karl-Heinz Sartor, Neuried, DE;
Wolf D Stege, Ludwigshafen, DE;
Peter Thoma, Frankenthal, DE;
Ewald Vollmerhaus, Dirmstein, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A continuous closed-system process for the environmentally friendly drying and purification of benzanthrone which comprises the steps of charging a benzanthrone-containing paste of pumpable consistency onto a melt held in a stirred kettle, dewatering and melting the paste by means of steam, condensing the water vapor emerging from the stirred kettle, flaking the melt from the stirred kettle by means of a rotating drum, and packaging the flaked solids.