Patents by Inventor Qi Chang-qing

Qi Chang-qing 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).

  • Substance 4181-2 and its derivatives having anti-leukemia activity
    Patent number: 4866069
    Abstract: Disclosed are a compound of the general formula ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and each represents a hydrogen atom, an alkyl group or an acyl group, process for the production thereof and use thereof. The compounds have an antitumor activity, and those wherein both of R.sub.1 and R.sub.2 represent a hydrogen atom or an acyl group are novel compounds.
    Type: Grant
    Filed: October 3, 1988
    Date of Patent: September 12, 1989
    Assignee: Taiho Pharmaceutical Company, Limited
    Inventors: Qi Chang-qing, Tian Jie, Teruyoshi Marunaka, Yuji Yamada, Ichiro Yamawaki, Toshio Ohtani, Yoshinori Minami, Hitoshi Saito
  • Substance 4181-2
    Patent number: 4814449
    Abstract: Disclosed are a compound of the general formula ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and each represents a hydrogen atom, an alkyl group or an acyl group, process for the production thereof and use thereof. The compounds have an antitumor activity, and those wherein both of R.sub.1 and R.sub.2 represent a hydrogen atom or an acyl group are novel compounds.
    Type: Grant
    Filed: May 11, 1987
    Date of Patent: March 21, 1989
    Assignee: Taiho Pharmaceutical Company, Limited
    Inventors: Qi Chang-qing, Tian Jie, Teruyoshi Marunaka, Yuji Yamada, Ichiro Yamawaki, Toshio Ohtani, Yoshinori Minami, Hitoshi Saito