Patents by Inventor Kazuto Hironaga

Kazuto Hironaga 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 preparation of 1,2,4,5-dimethyldiisopropylbenzene
    Patent number: 5808169
    Abstract: A process for preparing 1,2,4,5-dimethyldiisopropylbenzene includes conducting alkylation of p-xylene with propylene to produce an alkylation product, and crystallizing the alkylation product. A heteropolyacid-supported catalyst can be used as an alkylation catalyst for the reaction. The reaction solution produced from the alkylation reaction can be distilled before crystallization to improve yield and purity even more.
    Type: Grant
    Filed: August 18, 1997
    Date of Patent: September 15, 1998
    Assignee: Mitsubishi Oil Co., Ltd.
    Inventors: Hirofumi Aizono, Takeshi Kouchi, Kazuto Hironaga