Patents by Inventor Richard C. Hack

Richard C. Hack 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: 4673659
    Abstract: Lightweight concrete roof tiles are produced by extruding a cement/lightweight aggregate/water mix containing a non-thixotropic silica fume in a weight ratio of silica fume (calculated as dry weight) to cement of about 2:98 to about 25:75, preferably about 8:92 to about 12:88. The presence of non-thixotropic silica fume in the mix enables lightweight roof tiles of adequate flexural strength to be obtained from the mix by extrusion. Novel cement/lightweight aggregate/water mixes containing non-thixotropic silica fume and novel roof tiles prepared therefrom are also described.
    Type: Grant
    Filed: January 9, 1985
    Date of Patent: June 16, 1987
    Assignee: Marley Tile AG
    Inventors: John W. M. Wood, Richard C. Hack