Patents by Inventor Chan-Chuan Chen

Chan-Chuan Chen 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).

  • Electronic musical keyboard operated by foot for amusement and exercise
    Patent number: 6743971
    Abstract: An electronic amusement-exercise device includes a keyboard, an electronic circuit board disposed in the keyboard, and a plurality of keys mounted on the keyboard. As the keys are treaded on by the feet of a person, musical tones are reproduced through a loud speaker which is fastened to the keyboard.
    Type: Grant
    Filed: January 13, 2003
    Date of Patent: June 1, 2004
    Assignee: Red Tower, Inc.
    Inventor: Chan-Chuan Chen