Patents by Inventor Kazuhiko Matsumura

Kazuhiko Matsumura 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 optically active carboxylic acid
    Patent number: 5563295
    Abstract: A process for the production of an optically active carboxylic acid (I), which comprises subjecting an olefinic carboxylic acid (II) to asymmetric hydrogenation using a complex as a catalyst consisting of an optically active phosphine (III) and a ruthenium compound.Complex of ##STR1## with a ruthenium compound ##STR2## According to the process of the present invention, optically active carboxylic acids can be produced with high yield.
    Type: Grant
    Filed: March 7, 1995
    Date of Patent: October 8, 1996
    Assignee: Takasago International Corporation
    Inventors: Hidemasa Takaya, Xiaoyong Zhang, Kazuhiko Matsumura, Noboru Sayo, Hidenori Kumobayashi
  • Phosphine compound, complex containing the phosphine compound as ligand, process for producing optically active aldehyde using the phosphine compound or the complex, and 4-[(R)-1'-formylethyl]azetidin-2-one derivatives
    Patent number: 5530150
    Abstract: A phosphine compound represented by one of the formulas: ##STR1## wherein R.sup.1 and R.sup.2, which may be the same or different, each represent a phenyl group or a phenyl group substituted with a halogen atom or a lower alkyl group or taken together form a divalent hydrocarbon group; and R.sup.3 and R.sup.4, which may be the same or different, each represent a lower alkyl group, a phenyl group or a phenyl group substituted with a halogen atom, a lower alkyl group or a lower alkoxy group or taken together form a divalent hydrocarbon group, and wherein R.sup.6 and R.sup.6' which may be the same or different, each represent a hydrogen atom, a lower alkyl group or a lower alkoxy group; R.sup.5, R.sup.5', R.sup.11 and R.sup.11' which may be the same or different, each represent a hydrogen atom, a lower alkyl group, a lower alkoxy group or a halogen atom; or a pair of R.sup.5 and R.sup.6 or a pair of R.sup.5' and R.sup.6' may form a ring; R.sup.7 and R.sup.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: June 25, 1996
    Assignee: Takasago International Corporation
    Inventors: Hidemasa Takaya, Nozomu Sakai, Kyoko Tamao, Satoshi Mano, Hidenori Kumobayashi, Tetsuo Tomita, Takao Saito, Kazuhiko Matsumura, Yasushi Kato, Noboru Sayo