Patents by Inventor Won-Dae Cheong

Won-Dae Cheong 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).

  • Photoresist and method of manufacturing the color cathode-ray tube by use thereof
    Patent number: 5002844
    Abstract: Photoresist for forming the phosphor screen of color cathode-ray tube made up of the composition rate of pure water 10-50%, polyvinyl alcohol 5-30%, dichromate potassium salt 0.5-5%, diethylene glycol 0.5-10%, ethylene glycol 0.5-5%, urea 0.5-10%, acetamide 0.5-5%, butanediol 0.5-10%, paraaldehyde 0.5-5%, dioxane 0.5-5%, a surfactant 0.5-5%.
    Type: Grant
    Filed: August 31, 1988
    Date of Patent: March 26, 1991
    Assignee: Samsung Electron Devices Co., Ltd.
    Inventors: Won-Dae Cheong, Sang-Yul You, Soo-Min Jeong