Patents by Inventor Walter Hellriegel

Walter Hellriegel 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).

  • Patent number: 5648867
    Abstract: An objective has a first group of lenses with a first optical axis and a second group of lenses with a second optical axis. The optical axes are offset from and parallel to one another. A pair of Porroprisms is disposed between the first lens group and the second lens group and serves to rotate images. The Porroprisms cause a shift in optical axis, and the first and second optical axes are spaced from each other by a distance corresponding to this shift. The arrangement is such that light travelling along the optical axis of one lens group can enter the Porroprisms for reflection to the optical axis of the other lens group. The first lens group has negative refractive power while the second lens group has positive refractive power. A rhomboidal prism is located on the side of the second lens group remote from the Porroprisms and functions to cause a shift in optical axis equal but opposite to the shift caused by the Porroprisms.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: July 15, 1997
    Assignee: Agfa-Gevaert AG
    Inventors: Walter Hellriegel, Eberhard Dietzsch
  • Patent number: 4349244
    Abstract: The invention is directed to improving alignment of optical components within an overall objective cylinder along an optical axis by providing an outside source of compressed air which flows into and out of the outer hollow cylinder of the objective, through defined passages between the inside surface of the hollow objective and the imaging optical components within the hollow cylinder, to accurately align the inner optical components with an optical axis.
    Type: Grant
    Filed: April 23, 1980
    Date of Patent: September 14, 1982
    Assignee: Jenoptik Jena GmbH
    Inventor: Walter Hellriegel