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:
Mar. 27, 1984
Filed:
Jun. 28, 1982
Applicant:
Inventors:
Lester P Burton, Pleasant Ridge, MI (US);
Ronald L Shubkin, West Bloomfield, MI (US);
Assignee:
Ethyl Corporation, Richmond, VA (US);
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
2605 / ; 568703 ; 568711 ;
Abstract
The sulfonation of o-alkylphenols by reaction with sulfuric acid is improved to give higher conversion to disulfonated o-alkylphenol by adding a small amount of a polybasic carboxylic acid (e.g. oxalic acid) to the o-alkylphenol. The sulfonated product is converted to a dinitro-o-alkylphenol by reaction with nitric acid or salt thereof.