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. 18, 1989
Filed:
Sep. 21, 1987
Applicant:
Inventors:
Alan M Aaronson, Flushing Meadows, NY (US);
Robert L Protzmann, New City, NY (US);
John Tomko, Dobbs Ferry, NY (US);
Assignee:
Akzo America Inc., New York, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568 34 ;
Abstract
Diaryl sulfones are formed in a two-stage procedure. The first involves the reaction of an aryl sulfonic acid with an aryl reagent containing active hydrogen while by-product water is removed azeotropically. In the second stage, which contains unreacted sulfonic acid, is treated with a sulfone condensing agent and additional aryl reagent to react additional, unreacted aryl sulfonic acid from the first stage.