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:
Apr. 04, 2000
Filed:
May. 20, 1998
Applicant:
Inventor:
Yuichi Tomoda, Fukui, JP;
Assignee:
Nicca Chemical Co., Ltd., Fukui, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568 33 ; 568 32 ;
Abstract
The present invention provides a method of making 4-hydroxy-4'-benzyloxydiphenyl sulfone. The manufacturing method of the present invention is characterized in that an aqueous solvent containing an appropriate amount of a lower alcohol is used as a reaction solvent between 4,4'-dihydroxyphenyl sulfone and a benzyl halide.