Patents by Inventor Hans J. Schrecke

Hans J. Schrecke 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).

  • Projection copying apparatus and projection screen therefor
    Patent number: 5003343
    Abstract: A projection copying apparatus for reproducing microfilmed originals on a light-tightly disposable projection screen and for producing copies of microfilmed originals comprises means for copying of dot originals operating for complete or sectional copying of the originals, and a projection screen including a diffusing disc, an LCD dics arranged on the diffusing disc, the LCD disc being switchable between two conditions so that in one of the conditions it is transparent for observation of the originals and in the other of the conditions it is opaque for copying or searching.
    Type: Grant
    Filed: February 1, 1990
    Date of Patent: March 26, 1991
    Assignee: AGFA-Gevaert AG
    Inventors: Hubert Hackenberg, Traugott Liermann, Franz Nadler, Herbert Plaschke, Hans J. Schrecke