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:
Sep. 13, 1977
Filed:
Jun. 08, 1976
Applicant:
Inventors:
Ulrich Pintschovius, Hattersheim (Main), DT;
Erich Schinzel, Hofheim, Taunus, DT;
Gunter Rosch, Altenhain, Taunus, DT;
Assignee:
Hoechst Atiengesellschaft, Frankfurt am Main, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2603 / ; 260 / ; 260 / ; 2604 / ; 2604 / ; 260519 ; 25230128 ; 560 43 ; 560 44 ;
Abstract
Compounds of the general formula I ##STR1## in which R represents hydrogen or a lower alkyl radical which may be further substituted, n is an integer of from 1 to 4, and which may contain further non-chromophoric substituents. They are prepared by reaction of the dichloride of naphthalene-1,4-dicarboxylic acid with an o-aminophenol and subsequent ring closure. These compounds can be used as optical brighteners.