Patents by Inventor Michael David Key

Michael David Key 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).

  • Manufacture of detergent compositions
    Patent number: 4102057
    Abstract: Spray-dried fabric washing detergent powders based on nonionic surfactants are prepared by a process involving the step of injecting a phosphoric acid ester into the high pressure line carrying slurry to the spray-drying tower. The phosphoric acid ester is dissolved or dispersed in a nonionic surfactant such as a long chain alcohol ethoxylate and injected into the pressurized slurry either using a venturi effect or by being pressurized to a higher pressure.
    Type: Grant
    Filed: March 3, 1977
    Date of Patent: July 25, 1978
    Assignee: Lever Brothers Company
    Inventors: Michael David Key, William Gordon McNee
  • 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