Patents by Inventor Kohichi Endoh

Kohichi Endoh 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).

  • N-heterocyclic platinum complexes
    Patent number: 4822892
    Abstract: Novel platinum complexes represented by the formula: ##STR1## wherein A is alkylene having carbon atoms of from 1 to 3; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different and are hydrogen or alkyl having carbon atoms of from 1 to 4; X and Y are independently a halogen atom, or combined together to form ##STR2## and l, m and n are independently 0 or 1, and a process for preparing the same are disclosed.These platinum complexes have high antitumor activity and low toxicity, and are easily soluble in water. Therefore, they are very useful as an antitumor agent.
    Type: Grant
    Filed: February 24, 1988
    Date of Patent: April 18, 1989
    Assignee: Chugai Seiyaku Kabushiki Kaisha
    Inventors: Masamitsu Honda, Kazumi Morikawa, Kohichi Endoh