Patents by Inventor Ken'ichi Yamasaki

Ken'ichi Yamasaki 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).

  • Cassette removable piece
    Patent number: 4564878
    Abstract: One broad wall of a recording cassette has a recognition hole which is covered by a breakout tab (here called a "removable piece"), and there is a chamber projecting from the other broad wall of the cassette such that a punch which dislodges the removable piece permanently wedges it into the chamber.
    Type: Grant
    Filed: February 7, 1984
    Date of Patent: January 14, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Mark W. Weavers, Charles D. Gebeke, Ken'ichi Yamasaki