Patents by Inventor Ming H. Ma

Ming H. Ma 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).

  • Stair climbing exercise device capable of playing with a video game machine
    Patent number: 5507708
    Abstract: A stair climbing exercise apparatus capable of playing with a video game machine including a body portion having a plurality of steps each of which is formed with a plurality of recesses, each of the recesses having a plurality of cavities, a pedal fitted in each of the recesses and having a plurality of protuberances adapted to be received in the cavities, a spring disposed within each of the cavities, and a micro-switch arranged in each of the recesses and under the pedal.
    Type: Grant
    Filed: June 16, 1994
    Date of Patent: April 16, 1996
    Inventor: Ming H. Ma