Patents by Inventor Takumi Hamana

Takumi Hamana 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).

  • Antiviral carbocyclic purine nucleosides
    Patent number: 4968674
    Abstract: A compound of the formula: ##STR1## wherein R is a hydroxyl group which may be protected and Y is a purine base which may be protected, and the saltts thereof, which are useful as an antiviral agent.
    Type: Grant
    Filed: March 5, 1987
    Date of Patent: November 6, 1990
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Yoshio Taniyama, Takumi Hamana, Ryuji Marumoto, Naoki Yamamoto