Patents by Inventor William John Stead

William John Stead 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).

  • Patent number: 6290975
    Abstract: A method is provided which treats or prevents gum disease involving applying to the gums an agent for maintaining or improving the permeability barrier of the gum.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: September 18, 2001
    Assignee: Unilever Home & Personal Care USA, division of Conopco, Inc.
    Inventors: Jonathan Edward Creeth, William John Stead, David Michael Williams
  • Patent number: 6287542
    Abstract: The present invention relates to a process for treating a mixture of a liquid oil and a copper chlorophyll extract with a mixture of at least 90% by weight of a C2-C4 alcohol, and water at a certain concentration. The thus treated mixture is then suitable for making micro capsules with a green colorer liquid core material comprising said mixture by means of complex coaceration. These microcapsules can be included in oral care products to import a speckled appearance thereto. The liquid oil is typically sunflower oil or paraffin oil, and the C2-C4 alcohol is typically ethanol or isopropanol.
    Type: Grant
    Filed: February 14, 2000
    Date of Patent: September 11, 2001
    Assignee: ilever Home & Personal Care USA, a division of Conopco, Inc.
    Inventors: Laurence Marie Bernard, Jonathan Edward Creeth, William John Stead
  • Patent number: 6153219
    Abstract: An oral care composition comprises capsules which comprise an encapsulated gent encapsulated by an encapsulating material stable in the presence of anionic surfactants, said encapsulated agent being capable of providing a cosmetic, sensory, protective or therapeutic benefit to the oral cavity, wherein the capsules' weight average particle size ranges from 100 to 2000 .mu.m and wherein the capsules are capable of being gradually crushed during brushing thereby releasing the encapsulated agent gradually during brushing, the foaming capability being maintained throughout brushing.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: November 28, 2000
    Assignee: Unilever Home & Personal Care USA, division of Conopco, Inc.
    Inventors: Jonathan Edward Creeth, Andrew Joiner, William John Stead