Patents by Inventor David Malcolm Porter

David Malcolm Porter 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).

  • Pigments
    Patent number: 3942999
    Abstract: Titanium dioxide pigments carrying diisopropanolamine have good dispersibility, minimum tendency to foaming, minimum retardation of drying time and develop high opacity without the requirement for the presence of water. Preferably, the pigments also carry one or more hydrous metal oxides, a phosphate and/or a silicate. The preferred method of manufacture of the pigmentary titanium dioxide is to dry mill the pigment in the presence of the diisopropanolamine.
    Type: Grant
    Filed: August 15, 1974
    Date of Patent: March 9, 1976
    Assignee: British Titan Limited
    Inventors: John James Hinley, David Malcolm Porter