Patents by Inventor Karl von Oppen

Karl von Oppen 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).

  • Toy blocks having natural shapes
    Patent number: 5735723
    Abstract: A set of blocks cut from the limbs and trunks of small trees is shown for making natural appearing stacks (20, 60). Each block has parallel upper and lower cuts (82, 84, 170, 171) across the blocks spaced a predetermined increment "I" or a multiple of increment "I" from each other. The remaining outer surfaces (90, 92) remain in their natural states complete with bark, protrusions, and other anomalies.
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: April 7, 1998
    Inventor: Karl von Oppen
  • Toy block having a natural shape
    Patent number: D410975
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: June 15, 1999
    Inventor: Karl von Oppen