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. 06, 1998
Filed:
Jul. 01, 1996
Applicant:
Inventor:
Srikanth Nanguneri, Franciscusberg, NL;
Assignee:
General Electric Company, Pittsfield, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568724 ;
Abstract
An improved process for the purification of solid dihydric phenol, preferably bisphenol-A recovered from a polymer containing the reaction residue of dihydric phenol units in the polymer structure by essentially dry distilling dihydric phenol in the presence of about 0.005 to about 0.05 weight percent of hypophosphorous acid based on the weight of dihydric phenol.