Patents by Inventor Pyong I. Cha

Pyong I. Cha 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).

  • High-torque dual-purpose hub assembly for the rear wheel of a multispeed bicycle
    Patent number: 5125489
    Abstract: A cylindrical cassette body contains the movable balls and ball-biasing springs of a ball-type clutch. The balls ride in grooves in an element disposed within the body. Exteriorly, the cog body has longitudinal keyways to receive internal teeth of a set of cogs all of which have the same internal diameter. The exterior of the body is also threaded and is selectively employed in combination with a free-wheeling cog adapter having two different outer diameters, such adapter receiving a set of cogs having two different inner diameters.
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: June 30, 1992
    Inventor: Pyong I. Cha
  • Hub unit for the rear wheel of a geared bicycle
    Patent number: D325368
    Type: Grant
    Filed: September 21, 1990
    Date of Patent: April 14, 1992
    Assignee: CYS-X Corporation
    Inventor: Pyong I. Cha