Patents by Inventor Hiromichi Yamaguchi

Hiromichi Yamaguchi 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).

  • Side-chain alkylation method
    Patent number: 5414174
    Abstract: There is disclosed a side-chain alkylation reaction wherein an alkyl aromatic compound having a benzyl hydrogen is reacted with unsaturated hydrocarbons to produce a desired target product with excellent selectivity. The reaction is conducted in the presence of an alkyl ether and an alkaline metal catalyst. In comparison with conventional methods, it was observed that target selectivity was improved remarkably when equimolar addition of the reactants was employed, that very little catalyst was needed, and that the catalyst could be treated as a linear or uniform system, allowing the reaction to be easily scaled to meet industrial requirements.
    Type: Grant
    Filed: June 7, 1993
    Date of Patent: May 9, 1995
    Assignee: Sumikin Chemical Co., Ltd.
    Inventors: Toshio Sato, Ikuo Ito, Hiromichi Yamaguchi, Kyoichi Takeda
  • Process for producing 2-amino-4-acylaminophenyl ether
    Patent number: 4248794
    Abstract: The present invention relates to a process for producing a 2-amino 4-acylaminophenyl ether by acylation of a 2,4-diaminophenyl ether with a good selectivity.
    Type: Grant
    Filed: July 2, 1979
    Date of Patent: February 3, 1981
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yozo Fujii, Hiromichi Yamaguchi