Patents by Inventor David Keys

David Keys 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).

  • Enzyme granules
    Patent number: 4009076
    Abstract: Enzyme granules, particularly for detergent compositions, are prepared having a granule core of solid material carrying an enzyme and a solid coating of plasticized resin free of the enzyme. The plasticized resin can be dextrin or sodium lignosulphonate containing a plasticizer such as glucose, sucrose urea, glycerol or ethylene glycol. The granules are made by spraying the enzyme-containing core with a concentrated aqueous solution of the plasticized resin.
    Type: Grant
    Filed: November 2, 1973
    Date of Patent: February 22, 1977
    Assignee: Lever Brothers Company
    Inventors: Robin John Green, Michael David Key, Keith William Murray