Patents by Inventor Shoji Cho

Shoji Cho 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).

  • Circular sporting article
    Patent number: 4690401
    Abstract: A circular sporting article comprising a core material in a ring shape made of a long and narrow strip of spring steel and a flexible covering material to cover said circular core material and having an overall diameter approximately corresponding to the shoulder length of a user and a sectional diameter which can be easily grasped by a user, which can be used by adults or children for improving their arm or leg strength or grasping power.
    Type: Grant
    Filed: September 30, 1985
    Date of Patent: September 1, 1987
    Assignee: Life Environment Research Laboratories
    Inventor: Shoji Cho