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:
May. 11, 1993
Filed:
Jun. 25, 1992
Applicant:
Inventors:
Dieter Freitag, Krefeld, DE;
Claus H Wulff, Krefeld, DE;
Alfred Eitel, Dormagen, DE;
Helmut Waldmann, Leverkusen, DE;
Uwe Westeppe, Mettmann, DE;
Manfred Hajek, Leverkusen, DE;
Klaus D Berg, Krefeld, DE;
Bernd Griehsel, Bottrop, DE;
Carl Casser, Koln, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568721 ; 568718 ; 568722 ; 568728 ; 526196 ;
Abstract
This invention relates to a process for the preparation of substituted cycloalkylidene bisphenols from phenols and special cycloalkanones in the presence of acid condensation catalysts and in the presence of water.