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:
Jan. 03, 1984
Filed:
Apr. 26, 1982
Gerd Leston, Pittsburgh, PA (US);
Koppers Company, Inc., Pittsburgh, PA (US);
Abstract
A process is disclosed for separating closely-boiling dihydric phenol compounds by treating a mixture of dihydric phenols with a metal halide salt. The metal halide salt preferentially forms a complex with one of the dihydric phenols over other related dihydric phenols in the mixture. The preferentially-formed complex of one of the dihydric phenols may then be isolated from the mixture and the complex decomposed to provide a product substantially enriched in, or substantially entirely composed of, one dihydric phenol. The process is particularly suitable for resolving a mixture comprising hydroquinone and catechol, or a mixture of hydroquinone and resorcinol, or a mixture of homocatechol and hydroquinone, or a mixture of catechol and resorcinol.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile