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:
Aug. 27, 2013
Filed:
Oct. 26, 2006
Applicants:
Shinya Okazaki, Ichihara, JP;
Kaori Matoishi, Ichihara, JP;
Kiyoshi Itou, Tokyo, JP;
Inventors:
Assignee:
Mitsui Chemicals, Inc., Minato-Ku, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 51/42 (2006.01);
U.S. Cl.
CPC ...
Abstract
Glycolic acid having a high purity is obtained by subjecting glycolic acid or a glycolic acid solution containing contaminants to double-chamber electrodialysis combined with one or more treatments selected from among treatment with an activated carbon, treatment with an ion exchange resin, concentration treatment and cooling crystallization.