Patents by Inventor Wendell E. Ellsworth

Wendell E. Ellsworth 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).

  • Windowed fire door
    Patent number: 4637182
    Abstract: The pane in a windowed fire retardant door is secured to the door by L-shaped metal clips which engage opposite surfaces of the pane and are nailed to the incombustible core of the door. The edges of the pane and of the hole in the door in which the pane is received are trimmed by bead strips that are nailed to the door. Each bead strip comprises a body of quadrangular cross-section of noncombustible mineral material and a plywood lamination bonded to that body over two of its longitudinal sides and a rounded corner at which those sides meet.
    Type: Grant
    Filed: April 7, 1986
    Date of Patent: January 20, 1987
    Assignee: Algoma Hardwoods, Inc.
    Inventors: Wendell E. Ellsworth, Raymond P. Birdsall