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:
Sep. 18, 1984
Filed:
Jun. 07, 1982
Applicant:
Inventor:
James W Cleary, Bartlesville, OK (US);
Assignee:
Phillips Petroleum Company, Bartlesville, OK (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548555 ; 260705 ;
Abstract
Water or acidified water can be used to extract N-methylpyrrolidone from a mixture containing phenol and N-methylpyrrolidone. In one embodiment of this invention water or acidified water can be used to extract N-methylpyrrolidone from the kettle bottoms of the N-methylpyrrolidone recovery column of a poly(phenylene sulfide) polymerization process.