Patents by Inventor Kohsaku Hirota

Kohsaku Hirota 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).

  • Purine derivative
    Patent number: 6028076
    Abstract: This invention relates to novel purine derivatives of formula (I): ##STR1## where R.sup.2 and R.sup.9 are hydrocarbon groups, R.sup.6 is an amino group and R.sup.8 is a hydroxyl, or acyloxy group. These purine derivatives are effective at promoting secretion of interferon in patients, and can be used to treat diseases against which interferon is effective.
    Type: Grant
    Filed: March 3, 1998
    Date of Patent: February 22, 2000
    Assignee: Japan Energy Corporation
    Inventors: Kohsaku Hirota, Yoshiaki Isobe, Nobuyoshi Chiba, Harumi Satoh, Haruo Takaku, Hiroyuki Matsui, Haruhisa Ogita
  • Pyrazole derivatives and their pharmaceutical use
    Patent number: 5849779
    Abstract: The present invention relates to a pyrazole derivative represented by formula (I) or (II) ##STR1## wherein R.sup.1 is hydrogen C2-C6 alkyl benzyl or phenyl; each of R.sup.2 and R.sup.3 is hydrogen, C1-C6 alkyl or benzyl; each of R.sup.4 and R.sup.5 is hydrogen, C1-C6 alkyl, C3-C6 alkenyl, C3-C8 cycloalkyl, benzyl or phenyl;X is oxygen or sulfur;R.sup.5 is hydrogen, C2-C6 alkyl, C3-C6 alkenyl, C3-C8 cycloalkyl or benzyl when R.sup.1 is benzyl, R.sup.2 is ethyl, R.sup.3 is hydrogen, and R.sup.4 is hydrogen, and its pharmaceutical use.
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: December 15, 1998
    Assignee: Japan Energy Corporation
    Inventors: Kohsaku Hirota, Hironao Sajiki, Yoshiaki Isobe, Yoichi Ohba, Hiroyuki Morita, Haruo Takaku, Nobuyoshi Chiba