Patents by Inventor Alois B. Kerkhoff

Alois B. Kerkhoff 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 of inspecting a web of translucent material, especially photographic paper
    Patent number: 5237181
    Abstract: A method of visually inspecting the formation of a web of translucent material by means of a device it moves past. The device consists of a source of light on one side of the web generating a beam of light of a desired hue and intensity that penetrates the web, and a video camera on the side of the web away from the source of light, intercepting the beam and converting it into a video signal that is forwarded to a monitor. The source of light emits the beam in a flash of duration t.sub.1 that is too short for the web to advance far enough while illuminated to blur the image. The image on the monitor is accompanied by a reference image.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: August 17, 1993
    Assignee: Felix Schoeller jr GmbH & Co. KG
    Inventors: Alois B. Kerkhoff, Wolfgang Storbeck