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:
Mar. 09, 1993
Filed:
Aug. 09, 1990
Siegfried Scheler, Wiesbaden, DE;
Gerhard Buhr, Koenigstein, DE;
Klaus Bergmann, Mainz-Bretzenheim, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
A process for preparing 7-hydroxy-1,2-naphthoquinone-2-diazide-4-sulfonic acid or salts thereof, of the general formula Z ##STR1## is disclosed in which X=hydrogen, a metal or an ammonium group, preferably an alkali metal or alkaline earth metal, especially sodium or potassium and the ammonium group. The compounds can be used as much or as intermediates or starting materials for the production of light-sensitive compounds and radiation-sensitive mixtures and materials.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile