Patents by Inventor Mitchell J. Willis

Mitchell J. Willis 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).

  • Treatment of clays with cationic polymers to prepare high bulking pigments
    Patent number: 4738726
    Abstract: A highly bulked kaolin pigment is prepared by mixing a small but effective amount of a water-soluble cationic polyelectrolyte flocculant with a kaolin clay pigment in the presence of water to prepare a bulked clay pigment product. Upon dewatering, the resultant polyelectrolyte treated clay product can be dispersed to form high solids clay-water slurries useful in making aqueous coating colors suitable for manufacturing coating lightweight publication papers or the pigment can be used as a filler for paper webs.
    Type: Grant
    Filed: May 12, 1986
    Date of Patent: April 19, 1988
    Assignee: Engelhard Corporation
    Inventors: Richard J. Pratt, Richard A. Slepetys, Saad Nemeh, Mitchell J. Willis