Patents by Inventor Guido Hitschmarin

Guido Hitschmarin 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).

  • Day and night film
    Patent number: 7419272
    Abstract: An optical element having a front side and a back side operates in an ambient lit mode and a backlit mode. The optical element includes a diffusely reflecting layer facing the front side for reflecting ambient light. A light absorbing layer faces the back side and is positioned to prevent back light from illuminating the diffusely reflecting layer. A plurality of light transmitting regions extend through the light absorbing layer and the diffusely reflecting layer for permitting back light to pass through in a restricted angular range without illuminating the diffusely reflecting layer.
    Type: Grant
    Filed: December 8, 2005
    Date of Patent: September 2, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: Kay-Uwe Schenke, Guido Hitschmarin, Stefan O. Dietrich, Robert Bennett, Paul E. Humpal, Keith M. Kotchick
  • Day and night film
    Publication number: 20070133095
    Abstract: An optical element having a front side and a back side operates in an ambient lit mode and a backlit mode. The optical element includes a diffusely reflecting layer facing the front side for reflecting ambient light. A light absorbing layer faces the back side and is positioned to prevent back light from illuminating the diffusely reflecting layer. A plurality of light transmitting regions extend through the light absorbing layer and the diffusely reflecting layer for permitting back light to pass through in a restricted angular range without illuminating the diffusely reflecting layer.
    Type: Application
    Filed: December 8, 2005
    Publication date: June 14, 2007
    Inventors: Kay-Uwe Schenke, Guido Hitschmarin, Stefan Dietrich, Robert Bennett, Paul Humpal, Keith Kotchick