Patents by Inventor Kichiji Enoki

Kichiji Enoki 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).

  • Process for the separation of 4,4'-dichlorodiphenylsulfone
    Patent number: 4012451
    Abstract: Pure 4,4'-dichlorodiphenylsulfone is separated from the reaction mixture containing 4,4'-dichlorodiphenylsulfone and the isomers thereof by adding the reaction mixture to the mixture of trichloroethylene or tetrachloroethylene, and water to extract 4,4'-dichlorodiphenylsulfone with said organic solvent and cooling the organic solution separated from the water layer to precipitate pure 4,4'-dichlorodiphenylsulfone.
    Type: Grant
    Filed: January 19, 1976
    Date of Patent: March 15, 1977
    Assignee: Nippon Soda Company Limited
    Inventors: Kichiji Enoki, Takeo Fukui, Takeo Yamamoto, Toshirou Okada, Yoshiaki Miyazaki