Patents by Inventor Norman A. Coombes

Norman A. Coombes 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).

  • Coating compositions
    Patent number: 4562226
    Abstract: Aqueous compositions suitable for forming on a substrate a temporary protective coating, which can subsequently be removed by treatment with an aqueous alkaline solution, comprise a sterically stabilized dispersion in an aqueous medium of particles of size range 0.1-10 .mu.m of a polymer derived from monomers including at least one acrylic monomer and from 5% to 40%, based on the total weight of monomers, of an ethylenically unsaturated monocarboxylic acid, or an equivalent proportion of an unsaturated polycarboxylic acid.
    Type: Grant
    Filed: December 28, 1983
    Date of Patent: December 31, 1985
    Assignee: Imperial Chemical Industries PLC
    Inventors: Norman A. Coombes, Michael R. Wilkinson, Charles W. A. Bromley
  • Coating compositions
    Patent number: 4544686
    Abstract: A washcoat composition suitable for application to tin-plated mild steel consists of an aqueous carrier medium and a binder comprising specified relative proportions of (A) a thermosetting acrylic polymer in the form of a sterically stabilized dispersion in the aqueous medium and (B) an epoxy resin, the composition additionally containing an acid catalyst, in particular phosphoric acid or chromic acid or an ammonium or amine salt thereof.
    Type: Grant
    Filed: May 30, 1984
    Date of Patent: October 1, 1985
    Assignee: Imperial Chemical Industries PLC
    Inventors: Charles W. Bromley, Brian A. Cooke, Norman A. Coombes