Patents by Inventor Erwin Hisge

Erwin Hisge 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).

  • Color compensation filter
    Patent number: 5625492
    Abstract: An interference filter having 17 coatings of alternating high and low index materials is located on the illumination path of an optical device and provides correction for green color distortion on the observation path and correction for blue color distortion on the photo path in order that both the observed image and photographed image are color neutral.
    Type: Grant
    Filed: May 13, 1994
    Date of Patent: April 29, 1997
    Assignee: Leica Mikroskopie und Systeme GmbH
    Inventors: Claus Gunkel, Erwin Hisge