Patents by Inventor Ikufumi Yoshitake

Ikufumi Yoshitake 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).

  • Pyrazoloquinoline derivatives
    Patent number: 5192768
    Abstract: A pyrazoloquinoline derivative having the formula (I): ##STR1## wherein R.sup.1, R.sup.2, and R.sup.3 independently represent a hydrogen atom or a lower alkyl group; R.sup.4 represents a hydrogen atom, a lower alkyl group, a halogen-substituted lower alkyl group, or a lower alkoxycarbonyl group; the dotted line means that the pyrazole ring has two conjugated double bonds; and R.sup.4 is bonded to the nitrogen atom at the 1-position or 2-position, or pharmacologically acceptable salts thereof. These compounds exhibit excellent anti-inflammatory activity and hepatic insufficiency treating activity.
    Type: Grant
    Filed: September 12, 1991
    Date of Patent: March 9, 1993
    Assignee: Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Fumio Suzuki, Yoshisuke Nakasato, Kenji Ohmori, Tadafumi Tamura, Hisashi Hosoe, Kazuhiro Kubo, Ikufumi Yoshitake