Patents by Inventor Masaaki Hiruta

Masaaki Hiruta 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 production of 2,6-dichloro-3,5-di(secondary or tertiary alkyl)toluene
    Patent number: 6271426
    Abstract: This invention relates to an improved process for producing 2,6-dichloro-3,5-di(secondary or tertiary alkyl)toluene represented by the following formula (I). The process comprises chlorinating 3,5-di(secondary and tertiary alkyl)toluene represented by the following formula (II) by reacting with a chlorinating agent in the presence of a Lewis acid together with an aromatic sulfur compound represented by the formula (III) as a promoter: wherein R1 and R2 are independently a secondary alkyl or tertiary alkyl group, Ar1 and Ar2 are independently an unsubstituted or substituted aromatic ring, and n is 1 or 2.
    Type: Grant
    Filed: April 15, 1998
    Date of Patent: August 7, 2001
    Assignee: Kureha Kagaku Kogyo K.K.
    Inventors: Toshio Hozumi, Takayuki Tanonaka, Hitoshi Takahashi, Hidenori Moe, Masaaki Hiruta, Tadahito Kasami