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. 01, 2001
Filed:
Oct. 06, 1999
Applicant:
Inventors:
Satoshi Okamoto, Ibaraki, JP;
Hisashi Watabu, Hyogo, JP;
Assignee:
Sumitomo Chemical Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
C07C / ;
Abstract
Provided is a method for purifying a cyanate at high yield from a cyanate crude product solution comprising a cyanate represented by the general formula (1), unsubstituted phenol and non-alcoholic solvent by contacting with a poor solvent containing an alcohol and water, to crystallize the cyanate: