Patents by Inventor Banford Johnathan

Banford Johnathan 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: 5509960
    Abstract: A composite particulate pigmentary material is disclosed which comprises an association of at least two chemically distinct materials in which the particles of one material carry a positive surface charge and the particles of the second material carry a negative surface charge and particles are held in association as a result of these surface charges. Also disclosed is a method for preparing composite particulate pigmentary material comprising forming aqueous dispersions of two particulate materials under conditions in which the surface charges of the particles of the two materials are of different signs and mixing the dispersions. Typical materials useful for preparing the composite include inorganic pigments, fillers and extenders and organic polymeric microspheres. The product is useful as a pigment in, for example, paints, inks, paper and plastics.
    Type: Grant
    Filed: May 12, 1993
    Date of Patent: April 23, 1996
    Assignee: Tioxide Group Services Limited
    Inventors: Leslie A. Simpson, John Robb, Banford Johnathan, Paul F. Dietz, John Temperley