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:
Jun. 18, 1991
Filed:
Feb. 01, 1990
Applicant:
Inventor:
Henry J Barda, Brunswick, NJ (US);
Assignee:
AKZO NV, Arnhem, NL;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568 33 ;
Abstract
Trivalent phosphorous compounds (e.g., phosphorous acid and dialkyl phosphites) if present in small amount during the reaction of phenol with a sulfonating agent or a phenol sulfonic acid yield a dihydroxydiphenyl sulfone product that is less colored.
Barda, Henry. (1991). Decolorization of dihydroxydiphenyl sulfone (U.S. Patent No. 5025090). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5025090
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile