Patents by Inventor Gary J. Lurken

Gary J. Lurken 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).

  • Adjustable stairway having retractable wheel carriage
    Patent number: 4768617
    Abstract: An adjustable stairway is disclosed that is supported on a retractable, wheel mounted carriage. A locking mechanism selectively maintains the carriage in a lowered, ground engaging position for easy maneuvering of the stairway. The weight of the stairway urges the carriage into a raised position when the locking mechanism is released, allowing the stairway to rest on stationary foot pads.
    Type: Grant
    Filed: July 16, 1987
    Date of Patent: September 6, 1988
    Assignee: Wenger Corporation
    Inventors: John E. Mason, Herman A. Clausen, Gary J. Lurken, Dale A. Sellner