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:
May. 05, 1987
Filed:
Dec. 23, 1985
Robert A Pyles, Evansville, IN (US);
Patrick J Mulvey, Mt. Vernon, IN (US);
General Electric Company, Mt. Vernon, IN (US);
Abstract
A process for separating cyclic oligomeric dihydric phenol carbonate from high molecular weight linear aromatic polycarbonate which comprises admixing a solution of aromatic polycarbonate and oligomeric dihydric phenol carbonate in a halogenated organic solvent with an antisolvent selected from the group consisting of butanol, isobutanol and an alkane of from five to about nine carbon atoms, inclusive, separating the solid aromatic polycarbonate from the solution of cyclic oligomeric dihydric phenol carbonate, increasing the antisolvent to halogenated organic solvent ratio and thereby precipitate the cyclic oligomeric dihydric phenol carbonate.