Patents by Inventor Kiyoshi Yagii

Kiyoshi Yagii 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).

  • Method of preparing 1,1,1,2-tetrafluoroethane from 1,1-dichloro-1,2,2,2-tetrafluoroethane
    Patent number: 4996379
    Abstract: 1,1,1,2-Tetrafluoroethane, a refrigerant, is formed with little formation of isomers or chlorofluoroethanes having not very different boiling points by reacting 1,1-dichloro-1,2,2,2-tetrafluoroethane (R-114a), which may contain up to about 25 wt% of 1,2-dichloro-1,1,2,2-tetrafluoroethane (R-114), with hydrogen gas in the presence of a palladium-on-active alumina catalyst at a temperature lower than 200.degree. C. and not lower than 120.degree. C. R-114a almost free of R-114 is obtained by reacting 1,1,1-trichloro-2,2,2-trifluoroethane with hydrogen fluoride in vapor phase in the presence of a catalyst prepared by partially fluorinating .gamma.-alumina by treatment with hydrogen fluoride gas.
    Type: Grant
    Filed: May 26, 1989
    Date of Patent: February 26, 1991
    Assignee: Central Glass Company, Limited
    Inventors: Hideki Oshio, Sadaharu Mishumi, Kiyoshi Yagii, Satoshi Yoshikawa, Katsuyoshi Murata
  • Method of dehalogenating halogenated hydrocarbon to yield elemental halogen
    Patent number: 4162948
    Abstract: A halogenated hydrocarbon such as a halogenated ethane or propane is dehalogenated by subjecting to electrolysis an aqueous reaction system containing the halogenated hydrocarbon, a halide of metal having dehalogenating ability and a detergent. The detached halogen leaves the reaction system in elemental form.
    Type: Grant
    Filed: April 13, 1978
    Date of Patent: July 31, 1979
    Assignee: Central Glass Company, Limited
    Inventors: Kiyoshi Yagii, Hideki Oshio