Patents by Inventor Kazuyoshi Kariu

Kazuyoshi Kariu 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 preparing 2-alkyl-6-ethylnaphthalene
    Patent number: 5321182
    Abstract: 2-Alkyl-6-ethylnaphthalene is prepared selectively and efficiently by the reaction of at least one kind of feed naphthalene selected from naphthalene and 2-alkylnaphthalenes with polyethylbenzenes at 50.degree. to 400.degree. C. in the presence of a solid acid catalyst.
    Type: Grant
    Filed: March 27, 1992
    Date of Patent: June 14, 1994
    Assignee: Nippon Steel Chemical Co., Ltd.
    Inventors: Genki Takeuchi, Mituru Shiroshita, Kazuyoshi Kariu, Yasuhiro Shimoura
  • Method for separating 2,6-diethylnaphthalene
    Patent number: 5300721
    Abstract: This invention provides a method for separating 2,6-diethylnaphthalene from a mixture of diethylnaphthalene isomers by contacting said mixture with zeolite producing the same powder X-ray diffraction pattern as faujasite and the method can efficiently separate 2,6-diethylnaphthalene from ethylation reaction products containing diethylnaphthalene isomers.
    Type: Grant
    Filed: September 4, 1992
    Date of Patent: April 5, 1994
    Assignee: Nippon Steel Chemical Co., Ltd.
    Inventors: Genki Takeuchi, Kazuyoshi Kariu, Mitsuru Shiroshita