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. 11, 1977
Filed:
Oct. 11, 1974
Applicant:
Inventors:
Wilfried Sahm, Kelkheim, Taunus, DT;
Erich Schinzel, Hofheim, Taunus, DT;
Gunter Rosch, Altenhain, Taunus, DT;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D01F / ; D01F / ; D06L / ;
U.S. Cl.
CPC ...
8 1 / ; 8137 ; 252542 ; 252558 ; 260 / ; 264 78 ;
Abstract
New bisbenzofuranes which are connected by a direct bond or a bridgemember being in conjugation with the double bonds of the furane nuclei are obtained by intra- or intermolecular condensation reactions. The products are useful as optical brighteners, especially for detergents.