Patents by Inventor Robert W. Espeland

Robert W. Espeland 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).

  • Polymer concrete compositions, structures made therefrom, and methods of manufacture
    Patent number: 6048593
    Abstract: A polymer concrete composition preparable by combining components comprising: a resin blend comprising at least one unsaturated vinyl ester resin and at least one unsaturated polyester resin; at least about 10 weight percent, based on the total weight of the composition, of extremely filler material having an average particle size of less than about 500 microns; and at least about 20 weight percent, based on the total weight of the composition, of fine filler material having an average particle size of about 500-1000 microns.
    Type: Grant
    Filed: November 8, 1996
    Date of Patent: April 11, 2000
    Assignee: Espeland Composite Technology, Inc.
    Inventors: John D. Espeland, Robert W. Espeland, Michael L. Olson
  • Polymer concrete compositions, structures made therefrom and methods of manufacture
    Patent number: 6034155
    Abstract: A polymer concrete composition preparable by combining components comprising: a resin blend comprising a major amount of at least one rigid unsaturated polyester resin; a minor amount of at least one flexible unsaturated polyester resin; a minor amount of at least one vinyl ester resin; and a minor amount of at least one thermoplastic resin; at least about 10 weight percent, based on the total weight of the composition, of extremely filler material having an average particle size of less than about 500 microns; and at least about 20 weight percent, based on the total weight of the composition, of fine filler material having an average particle size of about 500 microns to about 1000 microns.
    Type: Grant
    Filed: March 16, 1998
    Date of Patent: March 7, 2000
    Assignee: ECT Incorporated
    Inventors: John D. Espeland, Robert W. Espeland, Michael L. Olson