Patents by Inventor Kim Chung-Suk

Kim Chung-Suk 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).

  • Transmission device assembly for a bicycle
    Patent number: 5254042
    Abstract: A transmission device for a bicycle is provided including a first transmission for obtaining a forward driving force. The first transmission drives a first free wheel in conformity with movement of a first drive unit when a crank shaft is forwardly rotated. A second transmission obtains a forward driving force by converting a direction of the rotating force produced in a rotational direction of a second drive unit. The rotational direction is supplied to a second free wheel under a reverse rotation of the crank shaft. A forward driving force is obtained regardless of the rotational direction of the crank shaft, thereby improving an exercise effect.
    Type: Grant
    Filed: May 20, 1992
    Date of Patent: October 19, 1993
    Inventor: Kim Chung-Suk