Patents by Inventor Friedrich Dandl

Friedrich Dandl 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: 6024578
    Abstract: The invention provides a card for learning purposes, which has at least two holes 7, 8 of essentially the same size. At least three separate sections 9, 10, 11 are printed on the front side 1 of the card. In each case one section 9, 10 is assigned to one of the holes 7, 8. The card also has a rear side 6, which has a picture 5 or graphics printed on it, the picture 5 or the graphics on the rear side 6 of the card being arranged such that at least one of the holes 7, 8 is not an integrated constituent part of the picture 5 or of the graphics on the rear side 6 of the card.
    Type: Grant
    Filed: August 27, 1998
    Date of Patent: February 15, 2000
    Inventor: Friedrich Dandl