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:
Sep. 18, 1990
Filed:
Nov. 13, 1989
Applicant:
Inventors:
Paul S Hale, Baton Rouge, LA (US);
Kju H Shin, Baton Rouge, LA (US);
Assignee:
Ethyl Corporation, Richmond, VA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549255 ; 549203 ;
Abstract
Alkenyl succinic anhydrides having a decreased amount of tar and color bodies are made by the reaction of an olefin with maleic anhydride in the presence of an arylfluorophosphite (e.g. 2,2'-ethylidenebis(4,6-di-tert-butylphenyl) fluorophosphite) and optionally a hindered phenolic antioxidant such as 2,4,6-tri(3,5-di-tert-butyl-4-hydroxybenzyl) mesitylene.
Hale, Paul. (1990). Alkenyl succinic anhydrides process (U.S. Patent No. 4958034). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4958034
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile