Patents by Inventor Sung-U Ham

Sung-U Ham 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).

  • Focus magnet for a projection type cathode-ray tube
    Patent number: 5227752
    Abstract: The present invention relates to a focus magnet for a projection type cathode-ray tube where a non-magnetic heat insulating member is disposed between a magnet having a penetrating hole formed therein and a coil wound within the magnet, whereby it can minimize a variation of focusing characteristics of an electron beam due to the heat generated in operation of the projection type cathode-ray tube, and improve a degree of roundness of a coil wound within the magnet.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: July 13, 1993
    Assignee: Samsung Electron Devices Co., Ltd.
    Inventor: Sung-U Ham