Patents by Inventor Michael Z. Zhou

Michael Z. Zhou 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).

  • Retractable counterweight for straight-boom aerial work platform
    Patent number: 6341665
    Abstract: An aerial work platform apparatus includes a shiftable counterweight which shifts in response to movement of the boom in order to maintain optimum balance of the apparatus during movement of the boom and platform. The counterweight shifts towards and away from the front of the apparatus, and also in a vertical direction. Several constructions for shifting the counterweight are disclosed.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: January 29, 2002
    Assignee: Grove U.S. L.L.C.
    Inventors: Michael Z. Zhou, Robert D. Backer, Michael D. Griffin, Mark G. Neubauer