Patents by Inventor William T. Schwietz

William T. Schwietz 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).

  • Changeable graphics and methods of making and using same
    Patent number: 5962109
    Abstract: A backlit sign and its method of making and usage is disclosed. The sign has a translucent film with a first image, of color, a light-filtering film with a second image of color or of a graphic, and a masking film with a third image of a graphic. The order of assembly of the films determines whether a change of color or a change in graphics or both is achieved when the assembled sign is backlit.
    Type: Grant
    Filed: January 8, 1997
    Date of Patent: October 5, 1999
    Assignee: 3M Innovative Properties Company
    Inventor: William T. Schwietz