Patents by Inventor Francis C. Petersen

Francis C. Petersen 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).

  • Lightweight concrete roof tiles
    Patent number: 5395442
    Abstract: Lightweight concrete roof tiles are produced by extruding a latex/cement/lightweight aggregates/water mix in a prescribed sequence. The composition comprises:(a) 45-65 parts by weight of an acrylic latex emulsion;(b) 130-180 parts by weight of a cement;(c) 360-400 parts by weight of expanded shale lightweight aggregates; and(d) 50-75 parts by weight of additional water.This lightweight concrete roof tile of the present invention is about half the weight and about the same strength, and absorbs the same amount of water of conventional roof tiles.
    Type: Grant
    Filed: April 14, 1993
    Date of Patent: March 7, 1995
    Assignee: Boral Concrete Products, Inc.
    Inventors: Harvey R. Dunton, Francis C. Petersen