Patents by Inventor Choi Y. Soo

Choi Y. Soo 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).

  • Roll-type learning aid apparatus for reading and memorizing
    Patent number: 4583951
    Abstract: A roll-type apparatus as a learning aid for reading and memorizing, the apparatus including a case provided with a display window therein, a word-listed paper ribbon wound about a pair of roll-shafts, forward and backward knobs interlocked with the roll-shafts by pinions, and guide rods for maintaining the ribbon under tension and in alignment with the display window during travel between the roll-shafts.
    Type: Grant
    Filed: June 11, 1985
    Date of Patent: April 22, 1986
    Assignee: Foundation Korea Campus Crusade for Christ
    Inventor: Choi Y. Soo