Patents by Inventor Ludwig Kummer

Ludwig Kummer 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).

  • Microscope objective for accommodating different cover-glass thicknesses
    Patent number: 4953962
    Abstract: A microscope objective adjustable for different thicknesses of cover-glass includes a second lens (L2 and L3) movable between a first lens (L1) and a third lens (L4) and a fourth lens (L5) movable with the second lens, but in an opposite direction. A ring that accomplishes movements of the second and fourth lenses also resets the focus of the objective. All movements are linear and are arranged to maintain the correction of image error while the objective is adjustable over a wide range of cover-glass thicknesses from 0 to 2 mm.
    Type: Grant
    Filed: March 30, 1989
    Date of Patent: September 4, 1990
    Assignee: Carl-Zeiss-Stiftung
    Inventors: Karlheinz Esswein, Ludwig Kummer