Patents by Inventor Robert Michael Christie

Robert Michael Christie 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).

  • Abrasion resistant polymer
    Patent number: 6203906
    Abstract: A polymer formulation of the kind including a polymer such as PVC or thermosetting polyester acrylic or epoxy and generally soft filler materials in an amount of 50-300 parts per 100 of resin, contains 0.05-5% of an abrasion-resistant additive which is silicon carbide or an &agr;-alumina selected from calcined unground alumina having a median crystallite size of at least 5.5 &mgr;m, and calcined and ground alumina having a median particle size of at least 3.0 &mgr;m, and tabular alumina. Shaped products and coating films formed from such formulations are also included.
    Type: Grant
    Filed: August 13, 1999
    Date of Patent: March 20, 2001
    Assignee: Alcan International Limited
    Inventors: Robert Michael Christie, Kenneth Arthur Evans, Jennifer Carolyn Southern, Richard John Cowton