Patents by Inventor Douk-soo Cha

Douk-soo 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).

  • Coupling apparatus, development cartridge and electrophotographic printer having the same
    Patent number: 6768890
    Abstract: A coupling apparatus to transfer a rotation force in a connected state. The apparatus has a first coupler having a first sloping rib formed at one end thereof and sloped in a rotation direction, and a second coupler having a second sloping rib formed at an inner circumference of the second coupler and sloped to correspond to the first sloping rib. The sloping ribs are connected by being pressed as the first coupler and the second coupler are relatively rotated, and rotation axes of the couplers coincide when the sloping ribs are completely connected.
    Type: Grant
    Filed: June 10, 2002
    Date of Patent: July 27, 2004
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Mun-son Cho, Kyung-hwan Jang, Douk-soo Cha