Patents by Inventor Dean C. Kassera

Dean C. Kassera has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of purifying pyrethrum extract
    Patent number: 3952047
    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.
    Type: Grant
    Filed: January 11, 1974
    Date of Patent: April 20, 1976
    Assignee: McLaughlin Gormley King Company
    Inventors: Joseph B. Moore, Dean C. Kassera