Patents by Inventor Ko D. Cho

Ko D. Cho 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).

  • Hydrogenation catalyst and methods for its preparation and use to convert silicon tetrachloride to chlorosilane and silane
    Patent number: 4701430
    Abstract: There is disclosed a redistribution catalyst which is the reaction product of a quaternary ammonium halide salt or tertiary amine, and an inorganic carrier having surface hydroxyl groups, such as silica, zeolite, clays, and silicone resins. The catalyst is useful for the redistribution of chlorosilicon hydrides to dichlorosilane and silane at reaction conditions of a temperature from 0.degree. to about 200.degree. C., and a pressure from about 0.1 to 10 atmospheres, in liquid or vapor phase.
    Type: Grant
    Filed: August 11, 1986
    Date of Patent: October 20, 1987
    Assignee: Korea Advance Institute of Science & Technology
    Inventors: Il N. Jung, Ko D. Cho, John C. Lim, Bok-Ryul Yoo
  • Redistribution catalyst and methods for its preparation and use to convert chlorosilicon hydrides to silane
    Patent number: 4613491
    Abstract: There is disclosed a redistribution catalyst which is the reaction product of a quaternary ammonium halide salt or tertiary amine, and an inorganic carrier having surface hydroxyl groups, such as silica, zeolite, clays, and silicone resins. The catalyst is useful for the disproportionation of chlorosilicon hydrides to dichlorosilane and silane at reaction conditions including a temperature from 0.degree. to 200.degree. C., in liquid or vapor phase with a pressure from 0.1 to 10 atmospheres.
    Type: Grant
    Filed: May 14, 1985
    Date of Patent: September 23, 1986
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Il N. Jung, Ko D. Cho, John C. Lim, Bok-Ryul Yoo