Patents by Inventor David L. Hamann

David L. Hamann 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).

  • Floor sign extension attachment
    Patent number: 4796369
    Abstract: A sign extension attachment for a self-standing floor sign having two panels (28) and (29) connected at their upper ends by hinge means (30) including a transverse handle (31), the attachment comprising a panel (10) having spreadable sleeve portions (18) and (22) for wrapping around the handle (31).
    Type: Grant
    Filed: July 6, 1983
    Date of Patent: January 10, 1989
    Assignee: Rubbermaid Commercial Products Inc.
    Inventor: David L. Hamann
  • Round hook
    Patent number: D306689
    Type: Grant
    Filed: June 29, 1988
    Date of Patent: March 20, 1990
    Assignee: Rubbermaid Corporation
    Inventor: David L. Hamann