Patents by Inventor Takako Iida

Takako Iida 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).

  • Alkyl and aralkyl-substituted pyrrolocarbazole derivatives that stimulate platelet production
    Patent number: 5728709
    Abstract: Described herein is a pyrrolocarbazole derivative and a pharmaceutically acceptable salt thereof having the following formula (I): ##STR1## wherein R.sup.1 is lower alkyl or aralkyl; R.sup.2 is hydrogen, substituted or unsubstituted lower alkyl, lower alkenyl, or substituted or unsubstituted aralkyl; R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 may be the same or different, and are hydrogen, halogen, nitro, substituted or unsubstituted lower alkanoyl, NR.sup.9 R.sup.10, or OR.sup.11 ; R.sup.8 is hydrogen or is combined with R.sup.3 to form --CONR.sup.12 --; and when R.sup.1 is benzyl; R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are not simultaneously hydrogen. A compound of the present invention stimulates platelet production and is useful for treatment of thrombocytopenia.
    Type: Grant
    Filed: November 8, 1996
    Date of Patent: March 17, 1998
    Assignee: Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Yoji Ikuina, Chikara Murakata, Yutaka Saitoh, Yukimasa Shiotsu, Takako Iida, Tatsuya Tamaoki, Kinya Yamashita, Shiro Akinaga