Patents by Inventor Robert Birckhead

Robert Birckhead 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).

  • Patent number: 4442649
    Abstract: A fabricated wooden beam including at least two longitudinal wooden members spaced parallel and apart by a plurality of wooden blocks spaced between and along the length of the longitudinal members. A plurality of truss plates, each installed across one side of a block and spanning between each longitudinal member, provide structural integrity. The truss plates are installed in pairs with one across either face of each block at an acute angle to the longitudinal axis of the beam. Alignment of the generally parallel truss plates on one side of the beam is at an acute or preferably right angle to the alignment of the generally parallel truss plates on the opposite side of the beam. The preferred truss plate alignment of truss plates on both sides of the beam is at approximately 45.degree. to the longitudinal axis of the beam so that the beam has structural symmetry and optimal material utilization.
    Type: Grant
    Filed: October 18, 1982
    Date of Patent: April 17, 1984
    Inventors: Robert Birckhead, William R. McAlpine