Patents by Inventor Clarence Knutson

Clarence Knutson 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).

  • Starch microcapsules for delivery of active agents
    Patent number: 6669962
    Abstract: Polysaccharide-based shells are provided having use for forming water-dispersible microcapsular delivery systems for both hydrophilic and lipophilic drugs, pharmaceuticals, cosmetics and other active agents. These shells are prepared by intimately blending a solubilized polysaccharide with a lipophilic material to produce spherical droplets of the lipophilic material coated with the polysaccharide, diluting the emulsion with a solvent, and isolating the polysaccharide shells from the diluted emulsion.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: December 30, 2003
    Assignee: The United States of America as represented by The Secretary of Agriculture
    Inventors: George F. Fanta, Clarence A. Knutson, Kenneth Eskins, Frederick C. Felker
  • Starch microcapsules for delivery of active agents
    Publication number: 20010006698
    Abstract: Polysaccharide-based shells are provided having use for forming water-dispersible microcapsular delivery systems for both hydrophilic and lipophilic drugs, pharmaceuticals, cosmetics and other active agents. These shells are prepared by intimately blending a solubilized polysaccharide with a lipophilic material to produce spherical droplets of the lipophilic material coated with the polysaccharide, diluting the emulsion with a solvent, and isolating the polysaccharide shells from the diluted emulsion.
    Type: Application
    Filed: December 20, 2000
    Publication date: July 5, 2001
    Inventors: George Fanta, Clarence Knutson, Kenneth Eskins, Frederick Felker
  • Starch microcapsules for delivery of active agents
    Patent number: 6238677
    Abstract: Polysaccharide-based shells are provided having use for forming water-dispersible microcapsular delivery systems for both hydrophilic and lipophilic drugs, pharmaceuticals, cosmetics and other active agents. These shells are prepared by intimately blending a solubilized polysaccharide with a lipophilic material to produce spherical droplets of the lipophilic material coated with the polysaccharide, diluting the emulsion with a solvent, and isolating the polysaccharide shells from the diluted emulsion.
    Type: Grant
    Filed: August 18, 1998
    Date of Patent: May 29, 2001
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: George F. Fanta, Clarence A. Knutson, Kenneth Eskins, Frederick C. Felker
  • Production of high-pyruvate xanthan gum on synthetic medium
    Patent number: 4394447
    Abstract: A high-pyruvate xanthan gum, substantially free of insolubles and undesirable coloration, is produced by fermentation of Xanthomonas campestris on a carbohydrate-containing nutrient medium having (NH.sub.4).sub.2 HPO.sub.4 at a level of at least 0.15% as the primary nitrogen source, and having a total phosphate level of at least about 0.25%.
    Type: Grant
    Filed: May 23, 1978
    Date of Patent: July 19, 1983
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Martin C. Cadmus, Clarence A. Knutson, Jr.
  • Method for increasing solution viscosity of Arthrobacter stabilis polysaccharides
    Patent number: 4146705
    Abstract: The extracellular heteropolysaccharide produced by the bacterium Arthrobacter stabilis NRRL B-3225 is treated by acidification, drying, and controlled heating to substantially increase its viscosity in aqueous solutions and to tailor it to particular conditions of use.
    Type: Grant
    Filed: June 17, 1977
    Date of Patent: March 27, 1979
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventor: Clarence A. Knutson, Jr.