Patents by Inventor R. Bruce

R. Bruce 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).

  • Gypsum board
    Patent number: 5085929
    Abstract: In the improved gypsum board in accordance with this invention, the board has a gypsum core and first and second cover sheets of fibrous material on opposing faces. The core has a first stratum parallel to and adjacent the first cover sheet. This stratum does not contain any fibers of the fibrous material. This first stratum has relatively few voids and a substantially greater density than the central portion of the core of the board. The central portion of the core has a plurality of relatively large discrete voids substantially uniformly distributed throughout the central portion of the core. These voids have substantially spherical coherent walls.
    Type: Grant
    Filed: February 17, 1989
    Date of Patent: February 4, 1992
    Assignee: Domtar Inc.
    Inventors: R. Bruce, Dimitrios Mitakidis