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:
Aug. 04, 1987
Filed:
Mar. 21, 1985
Applicant:
Inventors:
Klaus Artz, Muttenz, CH;
Hans R Meyer, Binningen, CH;
Dieter Reinehr, Kandern, DE;
Kurt Weber, Basel, CH;
Assignee:
Ciga-Geiby Corporation, Ardsley, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
558388 ; 558404 ; 558406 ; 560 11 ; 560 41 ; 560 81 ; 562429 ; 562449 ; 562488 ; 564156 ; 568 34 ; 570184 ;
Abstract
Stilbene derivatives of the formula ##STR1## wherein X is chlorine or bromine, R.sub.1 is hydrogen, carboxyl, cyano, C.sub.1 -C.sub.6 -alkyl or a non-chromophorically esterified carboxyl group, and R.sub.2 and R.sub.3 independently of one another are each hydrogen, unsubstituted or non-chromophorically substituted C.sub.1 -C.sub.6 -alkyl or C.sub.3 -C.sub.4 -alkenyl, or a non-chromophoric substituent of the 2nd order. They are valuable intermediates for producing optical brighteners of the 4,4'-disubstituted stilbene series.