Patents by Inventor John F. DeStefan

John F. DeStefan 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).

  • Collapsible tower boom lift
    Patent number: 4775029
    Abstract: A collapsible boom lift comprised of upper and lower telescoping boom assemblies. The upper boom is pivotally connected to an upright support member which is pivotally connected at its lower end to the lower boom. The upright support member is maintained plumb during raising and lowering of the lower boom, and the operator's platform, carried at the end of the upper boom, is maintained level during raising and lowering the upper boom. The upright support member is always positioned within the perimeter of the chassis of the boom lift.
    Type: Grant
    Filed: October 8, 1987
    Date of Patent: October 4, 1988
    Assignee: JLG Industries, Inc.
    Inventors: Wayne P. MacDonald, John F. DeStefan