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:
Dec. 27, 1983
Filed:
Dec. 21, 1981
Applicant:
Inventors:
Carl Bagner, Paramus, NJ (US);
Arthur S Wildman, Martinsville, NJ (US);
Assignee:
Merck & Co., Inc., Rahway, NJ (US);
Primary Examiner:
Int. Cl.
CPC ...
C07H / ;
U.S. Cl.
CPC ...
536 169 ; 536 168 ; 536-71 ; 536 185 ;
Abstract
A process for the whole broth extraction of avermectins wherein the pH of the whole broth is adjusted with mineral acid and then contacted with a solvent extractant so that the avermectic active component is taken up by the solvent. The now avermectin rich extractant is then processed through a solvent concentration step and the avermectin isolated by conventional crystallization. The extractant is then recycled with appropriate make-up to extract a subsequent batch of whole broth.