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:
Apr. 14, 1981
Filed:
Apr. 26, 1979
Applicant:
Inventors:
Athanassios Tzikas, Pratteln, CH;
Jurgen Markert, Ettingen, CH;
Assignee:
Ciba-Geigy AG, Basel, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
260377 ; 260378 ;
Abstract
A process for the reductive removal of halogen atoms from amino-, acylamino- or hydroxyanthraquinones, said halogen atoms being bonded in the .alpha.-position and/or ortho-position to amino, acylamino or hydroxyl groups, which comprises carrying out the reductive removal in basic medium with hydrazine or hydrazine derivatives.