Patents by Inventor Frederick A. Leech

Frederick A. Leech 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).

  • Method of manufacturing box ladders
    Patent number: 5317798
    Abstract: A method of manufacturing box ladders having a pair of side rails and rungs wherein each of the side rails are assembled from a pair of section members having holes pre-formed prior to assembly of the side rail. The method provides reduced deformation in the manufacture of box ladders having cylindrical rungs and provides for the manufacture of box ladders having non-cylindrical shaped rungs.
    Type: Grant
    Filed: March 10, 1992
    Date of Patent: June 7, 1994
    Assignee: Featherlite Industries Ltd.
    Inventors: Michael S. Thompson, Frank Binder, Frederick A. Leech