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. 05, 1999
Filed:
Aug. 15, 1997
Applicant:
Inventors:
Hans-Josef Buysch, Krefeld, DE;
Reinhard Langer, Krefeld, DE;
Ulrich Notheis, Dormagen, DE;
Alexander Klausener, Koln, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548447 ; 548446 ;
Abstract
Carbazole can be prepared by dehydrogenation of compounds of the formula ##STR1## or by aminating dehydrogenation of compounds of the formula ##STR2## at 300.degree. to 600.degree. C. in the presence of hydrogen over an iridium catalyst or an iridium-containing catalyst.