Patents Represented by Attorney J. H. Dautremont

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  • Adjustable dot gain simulation for color proofing
    Patent number: 5014086
    Abstract: The image dot gain that normally occurs in a printing press is controllably simulated as a separate step in the process of producing accurate color proofs. The simulation is attained by placing a diffuser plate between a high-intensity light source and a color-separated image master along with its corresponding image receptor. By varying the position of the diffuser plate the percentage of image dot gain is accurately controlled as an independent variable without the need to alter the exposure time.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: May 7, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert C. Barry
  • Processor chemistry control strip reader and replenishment system
    Patent number: 4985320
    Abstract: A voltage set point system is employed to provide a constant illumination of a photographic test strip. The set voltage is used as the supply for a voltage divider comparator network for accurately determining exposed film density levels.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: January 15, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Charles D. Griffin