Patents by Inventor Yoshiichi Kumagai

Yoshiichi Kumagai 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 alkylating the side chain of alkyl-substituted aromatic hydrocarbons
    Patent number: 5625102
    Abstract: A method of alkylating the side chain of alkyl-substituted aromatic hydrocarbons. The method comprises the steps of thermally treating an alumina by calcining in air and then degassing under vacuum to prepare an alumina carrier, loading an alkali metal on the alumina carrier by an impregnation method using the alkali metal dissolved in liquid ammonia, thermally treating the alkali metal loaded alumina carrier under vacuum to prepare a catalyst, then reacting an alkyl-substituted aromatic hydrocarbon with an aliphatic monoolefin, using the catalyst, under an atmosphere substantially free of oxygen, water and carbon dioxide gas to alkylate the side chain of the alkyl-substituted aromatic hydrocarbon.
    Type: Grant
    Filed: December 27, 1994
    Date of Patent: April 29, 1997
    Assignee: Mitsubishi Oil Co., Ltd.
    Inventors: Takaya Matsumoto, Yoshiichi Kumagai, Fumio Kumata