Patents by Inventor H. W. Stankewitz

H. W. Stankewitz 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).

  • Combined bright field-dark field incident light illumination apparatus
    Patent number: 4881802
    Abstract: A combined bright field-dark field incident light apparatus 10 for a microscope instrument is described, in which in the dark field illumination the plane of the field diaphragm LF is projected into the object plane 25 via at least one intermediate image LF'. This comprises providing in the beam path at least three annular optical elements (19, 28, 29), arranged so that illuminating rays incident from a skew direction are also projected into the object plane 25. The form of the annular optical elements 19, 27 allows them to be assigned different optical properties at the same time.
    Type: Grant
    Filed: May 3, 1988
    Date of Patent: November 21, 1989
    Assignee: Ernst Leitz Wetzlar GmbH
    Inventor: H. W. Stankewitz