Patents by Inventor David P. Bishop

David P. Bishop 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).

  • Detergent powder and process for its preparation
    Patent number: 4783281
    Abstract: A spray-dried detergent powder contains from 15 to 40% by weight of anionic surfactant, from 20 to 70% by weight of sodium carbonate, from 5 to 20% by weight of sodium silicate and from 1 to 7.5% by weight of sodium bicarbonate, the weight ratio of sodium bicarbonate to sodium silicate being within the range of from 0.20:1 to 0.45:1. Optionally further sodium bicarbonate (up to 15% by weight) is postdosed to the spray-dried powder. The benefits of the invention are improved powder properties and, when further sodium bicarbonate is postdosed, mildness to hands.
    Type: Grant
    Filed: January 8, 1986
    Date of Patent: November 8, 1988
    Assignee: Lever Brothers Company
    Inventors: David P. Bishop, Peter J. Russell, Peter C. Knight
  • Detergent compositions
    Patent number: 4261869
    Abstract: The incorporation of small amounts of cationic surfactant and zwitterionic or semipolar detergent in a polyoxyalkylene nonionic detergent suppresses dye transfer in the wash.
    Type: Grant
    Filed: May 29, 1979
    Date of Patent: April 14, 1981
    Assignee: Lever Brothers Company
    Inventors: David P. Bishop, Robert T. Nelson