Patents by Inventor Douglas Martin Butcher

Douglas Martin Butcher 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).

  • Silica particulates
    Patent number: 6197875
    Abstract: A particulate silica which has been treated with a polymer oil jelly.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: March 6, 2001
    Assignee: Rhodia Limited
    Inventors: Ian Malcolm Mackinnon, Douglas Martin Butcher