Patents by Inventor Yuko Ohnishi

Yuko Ohnishi 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 the preparation of platinum compounds
    Patent number: 5959133
    Abstract: A process for the preparation of cis-platinum(II) complexes of 1,2-cyclohexanediamine isomers, represented by formula I, containing substantially no dihydroxoplatinum(IV) complex as an impurity. ##STR1## Deoxygenated water is used in all steps of the process, from charging of the starting materials; i.e., potassium tetrachloroplatinate and trans-(-)-1,2-cyclohexanediamine, to the acquisition of target complexes. In addition, a low-oxygen content atmosphere is applied as an operational environment to prevent deoxygenated water from degradation through oxygen absorption and to eliminate the possibility of direct oxidation of a platinum compound due to atmospheric oxygen.
    Type: Grant
    Filed: March 3, 1998
    Date of Patent: September 28, 1999
    Assignee: Tanaka Kikinzoku Kogyo K.K.
    Inventor: Yuko Ohnishi
  • Cis oxalato (trans 1-1,2-cyclohexanediamine) PT(II) having optically high purity
    Patent number: 5338874
    Abstract: Disclosed herein is cis-oxalato (trans-1-1,2-cyclohexanediamine) Pt(II) optically high purity. Because of its complete optical purity, the compound is effective as raw material of such a medicine as a carcinostatic agent. The complete optical purity of the above compound may be proved by comparing the respective melting points of the cis-oxalato (trans-1-1,2-cyclohexanediamine).
    Type: Grant
    Filed: April 7, 1993
    Date of Patent: August 16, 1994
    Assignee: Tanaka Kikinzoku Kogyo K.K.
    Inventors: Chihiro Nakanishi, Yuko Ohnishi, Junji Ohnishi, Junichi Taniuchi, Koji Okamoto, Takeshi Tozawa