Patents by Inventor Friedbert Freitag

Friedbert Freitag 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).

  • Photographic roller copying apparatus
    Patent number: 4592649
    Abstract: A photographic roller copying apparatus for processing films of different sizes includes a scanning device for determining a size of the film to be processed, an illuminating device, a film-supporting platform having at least one aperture adjustable to the size of the film to be processed by a pivotable plate provided on the illuminating device, and two projection systems interchangeably movable into a path of light from the illuminating device. One of the projection systems includes a pair of porroprisms for rotating the image of an original positioned in the image aperture by 90.degree..
    Type: Grant
    Filed: March 18, 1985
    Date of Patent: June 3, 1986
    Assignee: Agfa-Gevaert AG
    Inventors: Friedbert Freitag, Friedrich Hujer, Erich Nagel, Bernd Payrhammer, Wolfgang Zahn