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).

  • Automatically extendable astragal system
    Patent number: 6725602
    Abstract: An extendable astragal system (40) includes a housing (47), an actuating member (48) located in and slidably engaged with the housing (47), and an astragal (50) located in the housing (47) and slidably engaged with the housing (47) and the actuating member (48). A latch mechanism (80) retains the astragal (50) within the housing (47) when an ambient temperature is below a predetermined temperature. The latch mechanism (80) enables sliding movement of the actuating member (48) and resultant movement of the astragal (50) to an extended position outside of the housing (47) when the ambient temperature is at the predetermined temperature.
    Type: Grant
    Filed: January 21, 2003
    Date of Patent: April 27, 2004
    Inventor: William A. McWilliams
  • 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