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. 22, 1996
Filed:
Sep. 22, 1995
Applicant:
Inventors:
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568424 ;
Abstract
2- and 3-Nitrobenzaldehydes suitable for use as intermediates for the preparation of pharmaceuticals are obtained in a simple manner and without risk of uncontrolled decompositions by distilling mixtures of nitrobenzaldehyde isomers at bottom temperatures of at most 200.degree. C. in the presence of monomeric and/or polymeric aromatic amines and/or phenols and/or N- and S-containing phenothiazines.