Patents by Inventor David D. White

David D. White 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).

  • Personnel lift with clamshell cage assembly
    Patent number: 5803204
    Abstract: A clamshell cage assembly is provided for use in conjunction with a portable personnel lift. The personnel lift may be either a jib boom lift or a lift having a multi-sectional telescoping mast. The clamshell cage assembly has an upper and mid-level safety rail, portions of which pivot to a raised position which facilitates easy entry into the cage wherein the user does not have to stoop or use either hand to hold the cage open. The movable section of safety rail is then pulled downwardly by the user once he has entered the cage.
    Type: Grant
    Filed: January 28, 1997
    Date of Patent: September 8, 1998
    Assignee: UpRight, Inc.
    Inventors: David D. White, Alan E. Murphy