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. 06, 1976
Filed:
Jan. 21, 1974
Applicant:
Inventors:
Anton Horn, Kelkheim, Taunus, DT;
Erich Schinzel, Hofheim, Taunus, DT;
Wilfried Sahm, Kelkheim, Taunus, DT;
Gunter Rosch, Altenhain, Taunus, DT;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2603092 ; 8 1 / ; 8 542 ; 8162 / ; 8177 / ; 8179 ; 8180 ; 2602 / ; 2602 / ; 2602 / ; 2603 / ; 2603 / ; 260576 ; 260577 ; 2605709 ; 260578 ; 2523 / ; 2523 / ;
Abstract
Novel benzofuran containing a benzimidazolyl group are obtained by reacting a benzofuran containing a carboxylic acid halide group with either an ortho-phenylene diamine or an ortho-nitro-aniline derivative, in the latter case reducing the nitro intermediate to the corresponding (aminophenyl)-amide and splitting off water by closing the imidazole ring. The products are optical brighteners, especially for acrylonitrile polymers.