Patents by Inventor Christof Kehl

Christof Kehl 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).

  • Method for the visual inspection of the reproduction quality of drawing elements and elements for the execution of the method
    Patent number: 4419426
    Abstract: The present invention relates to a method and to elements for the execution of the method for the inspection of the reproduction quality of drawing elements which are exposed by means of a cathode ray tube on light-sensitive photo material. A simple and feasible development of the quality control of exposed photo material or other printing masters produced in this manner is achieved. The inspection ensues in that additional raster points are exposed which behave differently in response to different exposure and development conditions.
    Type: Grant
    Filed: March 5, 1982
    Date of Patent: December 6, 1983
    Assignee: Dr. -Ing. Rudolf Hell GmbH
    Inventor: Christof Kehl