Patents by Inventor Derek N. A. Speakman

Derek N. A. Speakman 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).

  • Paint manufacture
    Patent number: 4165418
    Abstract: A pigment dispersant suitable for use in making a series of paints, the dispersant being a copolymer of defined proportions of ethylenically unsaturated monomers containing hydroxy and/or amide groups, straight or branched chain alkyl groups of from 7 to 22 carbon atoms and optionally also groupings which can promote association of the copolymer with a pigment surface. A millbase made with the aid of such a dispersant can be combined in either loading or tinting operations with a wide range of different film-forming polymers.
    Type: Grant
    Filed: February 8, 1977
    Date of Patent: August 21, 1979
    Assignee: Imperial Chemical Industries Limited
    Inventor: Derek N. A. Speakman