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. 20, 1976
Filed:
Jan. 11, 1974
Applicant:
Inventors:
Joseph B Moore, Edina, MN (US);
Dean C Kassera, St. Louis Park, MN (US);
Assignee:
McLaughlin Gormley King Company, Minneapolis, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2604 / ;
Abstract
A method of purifying crude pyrethrum extract through the use of acetonitrile as the extracting agent comprising the method steps of mixing crude pyrethrum extract with acetonitrile, separating the acetonitrile-pyrethrum extract layer at a temperature effective to precipitate out undesirable impurities and waxes in such acetonitrile-pyrethrum extract, removing the acetonitrile by distillation, mixing the concentrated pyrethrum extract with an amount of mineral spirits effective to precipitate out undesirable impurities, and removing the mineral spirits by distillation.