Patents by Inventor William J. Granberg

William J. Granberg 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).

  • Rotationally molded salvage drum and recessed lid
    Patent number: 4709833
    Abstract: An improved rotationally molded salvage drum and double-walled reinforced recessed lid is sealed and secured with a conventional ring clamp, and is provided with vertical column ribs projecting outward from generally cylindrical sidewalls; in a preferred embodiment the diameter of the lower section is smaller than that of the upper section to permit nesting of the empty stacked drums.
    Type: Grant
    Filed: February 20, 1987
    Date of Patent: December 1, 1987
    Assignee: Essex Environmental Industries, Inc.
    Inventors: William J. Granberg, Richard A. Wagner, Gary W. Hundt
  • Industrial container
    Patent number: D305259
    Type: Grant
    Filed: February 19, 1987
    Date of Patent: December 26, 1989
    Assignee: Essex Environmental Industries, Inc.
    Inventors: William J. Granberg, Richard A. Wagner, Gary W. Hundt