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. 22, 1981
Filed:
Jun. 28, 1979
Maurice R Vallette, Precy-sur-Oise, FR;
Produits Chimiques Ugine Kuhlmann, Courbevoie, FR;
Abstract
The invention relates to a process for obtaining 1,5-dinitro-anthraquinone of high purity from crude mixtures of dinitro-anthraquinones. Said mixture is treated at a temperature ranging from 150.degree. C. to 200.degree. C. with an ester having a boiling point greater than 150.degree. C. derived from an aliphatic alcohol containing 1 to 4 carbon atoms and a mono- or di-carboxylic acid or phosphoric acid, and then, after possible cooling without the temperature falling below 150.degree. C., separating the insoluble material consisting essentially of 1,5-dinitro-anthraquinone.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile