Patents by Inventor Yoshihiro Ishizaka

Yoshihiro Ishizaka 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).

  • Benzopyran compounds, processes for their production and pharmaceutical compositions
    Patent number: 5095016
    Abstract: A compound of the formula (I): ##STR1## or a pharmaceutically acceptable salt thereof, wherein: R.sup.1 is a hydrogen atom, a substituted or unsubstituted C.sub.1-6 alkyl group, a C.sub.2-6 alkenyl group, a C.sub.2-6 alkynyl group or a R.sup.7 --CO-- group (wherein R.sup.7 is a C.sub.1-6 alkyl group, a phenyl group, a C.sub.2-6 alkenyl group which may be substituted by a phenyl group, or a C.sub.1-6 alkoxy group);R.sup.2 is a hydrogen atom, a substituted or unsubstituted C.sub.1-8 alkyl group, or a phenyl group;R.sup.3 is a hydrogen atom, and R.sup.4 is a hydroxyl group, or R.sup.3 and R.sup.4 together form a bond;each of R.sup.5 and R.sup.6 is a C.sub.1-4 alkyl group; andY is a cyano group, a halogen atom, a nitro group, a C.sub.1-6 alkyl group, a C.sub.2-6 alkynyl group, a C.sub.1-6 alkylcarbonyl group, a C.sub.1-6 alkoxy group, a di-C.sub.1-6 alkylaminocarbonyl group, an aryl group, a C.sub.1-6 alkoxycarbonyl group, a carboxyl group or a morpholinocarbonyl group.
    Type: Grant
    Filed: August 3, 1990
    Date of Patent: March 10, 1992
    Assignee: Kaken Pharmaceutical Co., Ltd.
    Inventors: Katuyuki Ohtuka, Nobuo Ishiyama, Yasuhito Iida, Kenji Seri, Takeshi Murai, Kazuko Sanai, Yoshihiro Ishizaka