Patents by Inventor Paul J. Purdy

Paul J. Purdy 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).

  • Aerial work apparatus
    Patent number: 5307898
    Abstract: An improved mast assembly for an aerial work apparatus having improved stability and safety. A telescoping vertical main mast is connected to a telescoping vertical auxiliary mast.
    Type: Grant
    Filed: March 8, 1993
    Date of Patent: May 3, 1994
    Inventors: Paul J. Purdy, Matthew S. Purdy
  • Manlift
    Patent number: 4511015
    Abstract: A manlift having improved stability and safety. A telescoping vertical mast driven by a package of integrally attached cylinders is attached to a rotating base plate slightly offset from the center line of rotation of the base plate. The direction of offset is in the direction opposite to the position of the aerial platform. The manlift also includes a novel arrangement for straddle-mounting the boom, whereby the weight of the cylinders driving the boom through its arc tends to counterbalance the platform. The straddle-mount also allows optimum working height while maintaining low travelling height in the vehicle.
    Type: Grant
    Filed: June 15, 1983
    Date of Patent: April 16, 1985
    Inventor: Paul J. Purdy