Patents by Inventor Chiman Hwang

Chiman Hwang 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).

  • Refillable ink ribbon cartridge for use in electronic typewriter
    Patent number: 4990008
    Abstract: A refillable ink ribbon cartridge for use in an electronic typewriter which includes a housing, a feed spool member having symmetric C-shaped springs for slidably receiving and removing a changeable feed spool, a winding spool member having a lever and a lever opener for slidably inserting and removing a winding spool, and a jagged wheel whereby the used ink ribbon cartridge can be reused and maintains a constant tension on the ink ribbon between the feed and winding spools.
    Type: Grant
    Filed: October 26, 1989
    Date of Patent: February 5, 1991
    Inventor: Chiman Hwang
  • Refillable ink ribbon cartridge for use in an electronic typewriter
    Patent number: 4986678
    Abstract: A refillable ink ribbon cartridge for use in an electronic typewriter which includes a housing, a feed spool having a semi-globe member for slidably mounted to and removed from a movable diamond-shaped plate, a winding spool for slidably inserting into and removed from the diamond-shaped plate, and a jagged wheel, whereby the used ink ribbon cartridge can be reused and maintains a constant tension on an ink ribbon between the feed and winding spool.
    Type: Grant
    Filed: December 5, 1989
    Date of Patent: January 22, 1991
    Inventor: Chiman Hwang