Patents by Inventor William McWilliams

William McWilliams 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).

  • Light-weight concrete door
    Patent number: 5860268
    Abstract: A three-hour fireproof door (20) is made from a metal frame (26), a body (28), and a hinge (30). The body (28) is made from a concrete mix (40). The metal frame (26) is such that, when attached to a mold base (34), the body (28) may be cast in place. The concrete mix (40) contains an integral strengthening material (54) in the form of either a metal mesh (54) or an elastomer admixture (82).
    Type: Grant
    Filed: March 4, 1997
    Date of Patent: January 19, 1999
    Inventor: William McWilliams