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:
Jun. 23, 1981
Filed:
Jul. 02, 1979
Nicholas P Greco, Pittsburgh, PA (US);
Koppers Company, Inc., Pittsburgh, PA (US);
Abstract
Effluent containing cresols such as are contained in Lurgi tar acids are separated by preferentially treating the cresols with an aqueous alkali metal carbonate or bicarbonate at elevated temperature for a time sufficient to form the alkali metal salt of at least part of the cresols, but not so long as to form any appreciable alkali metal salt of 2,6-xylenol or o-ethylphenol. The water soluble alkali metal salts of cresols are then separated from the water insoluble phenols and said salts acidified to 'spring' the cresols and the water insoluble cresols separated from the aqueous solution.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile