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. 22, 1994
Filed:
Aug. 02, 1993
Applicant:
Inventor:
Georg Grotsch, Bad Soden am Taunus, DE;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568 33 ;
Abstract
Process for the preparation of 4,4'-dihydroxydiphenyl sulfone in a high yield and high purity by reaction of phenol with a sulfonating agent in a chlorinated aromatic, in which phenol is reacted with a sulfonating agent in ortho-, meta- or para-chlorotoluene or in any desired mixture of these isomeric chlorotoluenes as the inert solvent, at temperatures of from about 100.degree. to about 200.degree. C.