Patents by Inventor Stephen M. Keith

Stephen M. Keith 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).

  • Microbiological production of essential fatty acids
    Patent number: 4851343
    Abstract: Production of .gamma.-linolenic acid, by growth of a diffused mycelial inoculum of Rhizopus arrhizus in a stirred, aerated nutrient medium containing a carbohydrate energy source and an inorganic nitrogen source at a carbon:nitrogen ratio of 20:1 to 60:1 maintained at a temperature of 25.degree. C..+-.2.degree. C. and a pH of 3.75 to 6.25 in the presence of a foam breaker, until a .gamma.-linolenic concentration of at least 1.0 g/liter of medium is reached, harvesting the organism, and extraction of lipid containing the .gamma.-linolenic acid.
    Type: Grant
    Filed: February 19, 1985
    Date of Patent: July 25, 1989
    Assignee: Efamol Limited
    Inventors: Rodney A. Herbert, Stephen M. Keith