Patents by Inventor Toshiro Takemasa

Toshiro Takemasa 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).

  • Ruthenium-phosphine complex
    Patent number: 4954644
    Abstract: A ruthenium-phosphine complex is disclosed, which is represented by formula (I):[Ru(R-BINAP)MCl.sub.k ].sub.l X.sub.m (I)wherein R-BINAP represents a tertiary phosphine represented by formula (II): ##STR1## wherein R represents hydrogen atom or methyl group; M represents Zn, Al, Ti, or Sn; X represents N(C.sub.2 H.sub.5).sub.3 or CH.sub.3 CO.sub.2 ; in the case that X represents N(C.sub.2 H.sub.5).sub.3, l is 2 and m is 1, and when M represents Zn, then k is 4, when M represents Al, then k is 5, and when M represents Ti or Sn, then k is 6; and in the case that X represents CH.sub.3 CO.sub.2, l is 1 and m is 2, and when M represents Zn, then k is 2, when M represents Al, then k is 3, and when M represents Ti or Sn, then k is 4.
    Type: Grant
    Filed: September 7, 1988
    Date of Patent: September 4, 1990
    Assignee: Takasago International Corporation
    Inventors: Noboru Sayo, Toshiro Takemasa, Hidenori Kumobayashi