Patents by Inventor Richard M. Bobbe

Richard M. Bobbe 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).

  • Patent number: 4227795
    Abstract: An optical system in which a movable photosensitive member is exposed to a light image of an original document. The optical system includes a light source which illuminates a screen having at least two adjacent spaced rows of opaque dots. Movement of the photosensitive member controls activation of the light source. The light source is activated periodically and responds to the photosensitive member moving a distance corresponding to the distance between adjacent rows of opaque dots on the screen.
    Type: Grant
    Filed: January 12, 1977
    Date of Patent: October 14, 1980
    Assignee: Xerox Corporation
    Inventors: Richard M. Bobbe, John A. Durbin, Richard F. Lehman, Frederick A. Seedhouse
  • Patent number: 4090786
    Abstract: An electrophotographic printing machine in which a screen interposed in the path of the light image modulates the light image irradiating the charged portion of a photoconductive member. The screen comprises a plurality of sets of light filtering regions. Each set of light filtering regions is substantially complementary in color to the color of the filtered light image, and rotated through a pre-selected angle relative to the next adjacent set of light filtering regions.
    Type: Grant
    Filed: May 21, 1976
    Date of Patent: May 23, 1978
    Assignee: Xerox Corporation
    Inventor: Richard M. Bobbe
  • Patent number: 4068940
    Abstract: An electrophotographic printing machine in which a latent image of an original document and a screen pattern are formed on a photoconductive member in superimposed registration with one another. The contrast of the screen pattern is regulated.
    Type: Grant
    Filed: September 13, 1976
    Date of Patent: January 17, 1978
    Assignee: Xerox Corporation
    Inventor: Richard M. Bobbe
  • Patent number: 4066353
    Abstract: A half-tone screen in which a first and second set of grooves are inscribed in a transparent member. The grooves are arranged in a repetitive pattern with each groove from the first set being interposed between adjacent grooves of the second set, and the width of each groove of the first set being greater than the width of each groove of the second set.
    Type: Grant
    Filed: September 13, 1976
    Date of Patent: January 3, 1978
    Assignee: Xerox Corporation
    Inventor: Richard M. Bobbe