Patents by Inventor William S. Halligan

William S. Halligan 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 grooving system
    Patent number: 4969380
    Abstract: An apparatus and method for forming a flat-bottomed V-groove in wallboard involving a pair of oppositely angled circular saws, wherein saw blades have an obtusely angled outer edge, as by grinding back one corner of each of a plurality of carbide tips on at least one of the two saw blades.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: November 13, 1990
    Assignee: National Gypsum Company
    Inventor: William S. Halligan