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. 25, 1995
Filed:
Jul. 29, 1992
Applicant:
Inventors:
Alex Junino, Livry-Gargan, FR;
Jean J Vandenbossche, Aulnay-sous-Bois, FR;
Gerard Lang, Saint-Gratien, FR;
Assignee:
L'Oreal, Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07B / ;
U.S. Cl.
CPC ...
548508 ; 558408 ; 558410 ;
Abstract
Process for the preparation of 5,6-dihydroxyindole, wherein the compound of formula: ##STR1## in which R' denotes a hydrogen atom or an optionally substituted benzyl radical, is subjected either to the action of hydrogen under pressure or to a hydrogen transfer operation, in a solvent medium and in the presence of a hydrogenation catalyst.