Patents by Inventor Su S. Ryu

Su S. Ryu 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).

  • Flap of video tape cassette and its installing structure
    Patent number: 5138510
    Abstract: The present invention relates to a flap which applies elastic pressure to the tape which runs in a Video Tape Cassette and its installing structure.The flap is formed by coating its both sides which use a PET(Polyethylene Terephthalate) film as the base with a composite containing a carbon black lubricant and a fitting method is adopted to install the flap.
    Type: Grant
    Filed: August 1, 1990
    Date of Patent: August 11, 1992
    Assignee: SKC Limited
    Inventor: Su S. Ryu
  • Support spring for a tape cassette
    Patent number: 5094434
    Abstract: The present invention provides a support spring which may be used in connection with cassettes, and particularly video cassettes. The support spring has a central portion which is adapted to be fixed to an inside surface of the upper portion of a cassette. The spring also includes a supplementary piece joining the central portion with a pressing part and a bending part which also joins the central part with the pressing part, the bending part being shorter than the supplementary piece.
    Type: Grant
    Filed: September 14, 1990
    Date of Patent: March 10, 1992
    Assignee: SKC Limited
    Inventor: Su S. Ryu
  • Tape cartridge with T-shaped braking lever
    Patent number: 5091813
    Abstract: Tape cartridge having a T-shaped brake lever or separable brake levers from the slider and forms needle-shaped ends at the ends of a T-shaped brake lever or separable brake levers and prevents the tape from being unwound by enabling the sawteeth parts to catch them but makes the positions of needle-shaped ends facing toward the sawteeth parts take their eccentric positions backward and inward contrary to the point where the former projections are located.
    Type: Grant
    Filed: July 7, 1989
    Date of Patent: February 25, 1992
    Assignee: SKC Limited
    Inventor: Su S. Ryu