Patents by Inventor Shinya Maehara

Shinya Maehara 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 producing tertiary phosphine
    Patent number: 7250535
    Abstract: A production process by which tertiary phosphine with an attached sterically bulky hydrocarbon group is produced in a high yield and with high purity on an industrial scale through simple and safe operations by allowing a dialkylphosphinous halide to react with a Grignard reagent in the presence of a copper compound in an amount corresponding to 0.1 to 5% by mol based on the dialkylphosphinous halide to produce tertiary phosphine represented by the following formula (3): wherein R1 and R2 are each a tertiary hydrocarbon group of 4 to 13 carbon atoms, and R3 is an alkyl group, an alkenyl group, an aryl group or the like.
    Type: Grant
    Filed: February 3, 2003
    Date of Patent: July 31, 2007
    Assignee: Hokko Chemical Industry Co., Ltd.
    Inventors: Shinya Maehara, Hideyuki Iwazaki
  • Process for producing tertiary phosphine having bulky hydrocarbon group bonded
    Publication number: 20060020148
    Abstract: A production process by which tertiary phosphine with an attached sterically bulky hydrocarbon group is produced in a high yield and with high purity on an industrial scale through simple and safe operations by allowing a dialkylphosphinous halide to react with a Grignard reagent in the presence of a copper compound in an amount corresponding to 0.1 to 5% by mol based on the dialkylphosphinous halide to produce tertiary phosphine represented by the following formula (3): wherein R1 and R2 are each a tertiary hydrocarbon group of 4 to 13 carbon atoms, and R3 is an alkyl group, an alkenyl group, an aryl group or the like.
    Type: Application
    Filed: February 3, 2003
    Publication date: January 26, 2006
    Applicant: HOLLO CHEMICAL INDUSTRY CO., LTD
    Inventors: Shinya Maehara, Hideyuki Iwazaki