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:
Feb. 08, 2011
Filed:
Mar. 19, 2007
Applicants:
Zhongqi Xu, Shanghai, CN;
Guohua Xiu, Shanghai, CN;
Tong Sun, Shanghai, CN;
Jingwu Yang, Shanghai, CN;
Inventors:
Zhongqi Xu, Shanghai, CN;
Guohua Xiu, Shanghai, CN;
Tong Sun, Shanghai, CN;
Jingwu Yang, Shanghai, CN;
Assignee:
General Electric Company, Schenectady, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07D 209/44 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for decoloring 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine ('p,p-PPPBP') is disclosed. The method comprises contacting a liquid solution containing p,p-PPPBP and the common impurities o,p-PPPBP and aminophenone with activated carbon fibers. The activated carbon fibers adsorb the impurities, resulting in a purified solution of p,p-PPPBP. The activated carbon fibers can then be regenerated, such as with a methanol solution having a highly basic pH.