Patents by Inventor Esther L. Allen

Esther L. Allen 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).

  • Column pad layout device, anchor bolt layout device, and layout methods
    Patent number: 4357755
    Abstract: A column pad layout fixture having a pair of intersecting cross-arms and a third arm fixed to the intersecting pair of arms. An anchor bolt layout having an elongated rod and a cooperating cross-arm. A method of placing and fixing an anchor bolt plate accurately in a mass of concrete freshly poured into an excavation located at intersecting column center lines to provide a base for a single vertical column of a line of columns. A method of laying out a rectangular or square area upon a plane or flat surface.
    Type: Grant
    Filed: June 23, 1980
    Date of Patent: November 9, 1982
    Inventors: William B. Allen, Esther L. Allen