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:
Dec. 06, 2011
Filed:
Jun. 27, 2007
Applicants:
Hubert Gayet, Villeurbanne, FR;
Bruno Heinisch, Villeurbanne, FR;
Jean-claude Le Thiesse, Saint-Etienne, FR;
Inventors:
Hubert Gayet, Villeurbanne, FR;
Bruno Heinisch, Villeurbanne, FR;
Jean-Claude Le Thiesse, Saint-Etienne, FR;
Assignee:
Rhodia Operations, Aubervilliers Cedex, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 37/74 (2006.01);
U.S. Cl.
CPC ...
Abstract
Purified hydroquinone is prepared and formed from raw compounds essentially containing hydroquinone associated with very small quantities of impurities including resorcinol and pyrogallol, and includes a distillation purification step in which the resorcinol and pyrogallol are eliminated, directly followed by a step in which the purified hydroquinone is formed.