Patents by Inventor Toshimichi Mitani

Toshimichi Mitani 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).

  • Processes for the preparation of steroid derivatives, intermediates therefor and processes for the preparation of the intermediates
    Patent number: 6310225
    Abstract: Steroid derivatives useful as intermediates for producing vitamin D derivates as well as processes for producing the steroid derivatives are provided. The steroid derivatives include halide compounds represented by the following formulae: wherein X, R1 and R2 are as defined by the specification.
    Type: Grant
    Filed: November 20, 2000
    Date of Patent: October 30, 2001
    Assignee: Kuraray Co., Ltd.
    Inventors: Yoshihisa Tsuji, Toshimichi Mitani
  • Method for producing bromomethylcyclopropane
    Patent number: 5973216
    Abstract: A method for producing bromomethylcyclopropane is provided, comprising reacting an organic sulfonyl halide with cyclopropylmethanol in the presence of a tertiary amine in a non-protic solvent, to generate cyclopropylmethyl organic sulfonate, and reacting the resulting cyclopropylmethyl organic sulfonate with an alkali metal bromide and/or a quaternary ammonium bromide in a non-protic polar solvent.
    Type: Grant
    Filed: February 13, 1998
    Date of Patent: October 26, 1999
    Assignee: Kuraray Co., Ltd.
    Inventors: Toshimichi Mitani, Tatsuhiko Hayashibara, Manzo Shiono
  • Process for the preparation of cyclopropylacetylene derivatives
    Patent number: 5955627
    Abstract: According to the present invention, a process for the preparation of a cyclopropylacetylene derivative represented by the following formula (III): ##STR1## is provided, which comprises reacting a cyclopropylacrylic acid derivative represented by the following formula (I): ##STR2## with a halogenating agent to obtain a halogenocyclopropylpropionic acid derivative represented by the following formula (II): ##STR3## and reacting the halogenocyclopropylpropionic acid derivative with a base.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: September 21, 1999
    Assignee: Kuraray Co., Ltd.
    Inventors: Makoto Nakazawa, Toshimichi Mitani, Yoichi Satake, Shigeo Oozono, Goro Asanuma, Manzo Shiono