Patents by Inventor Marcus Spieth

Marcus Spieth 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).

  • Optical device for sensing marks on a surface using green light impinging at least sixty-five degrees to the normal
    Patent number: 5291028
    Abstract: An optical device for sensing marks carried on an area to be sensed of a medium, especially printed and/or handwritten patterns, is disclosed. Sensing of marks is accomplished by inclined illumination of the area to be sensed by a light source (3) emitting shortwave light, especially in the green spectral area, and reception of reflected light by a photoreceptor (4).
    Type: Grant
    Filed: July 21, 1992
    Date of Patent: March 1, 1994
    Assignee: International Business Machines Corporation
    Inventors: David A. Droge, Ralf Fischer, Marcus Spieth