Patents by Inventor Michihisa Muramatsu

Michihisa Muramatsu 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).

  • Patent number: 4610986
    Abstract: A (7S,9S) isomer or its racemic modification of the aminonaphthacene derivative of the formula: ##STR1## wherein R.sup.1 is a hydrogen atom, a hydroxyl group or a lower alkoxy group, R.sup.2 is a hydrogen atom or a hydroxyl group, R.sup.3 and R.sup.4 are each a lower alkoxy group or, when taken together, represent an ethylenedioxy group or an oxo group, A is an ethylene group optionally bearing at least one lower alkyl and Q is a hydroxyl group, a lower alkoxy group or a dimethylamino group, or an acid addition salt thereof, which is useful as an anti-tumor agent.
    Type: Grant
    Filed: October 12, 1984
    Date of Patent: September 9, 1986
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kikuo Ishizumi, Michihisa Muramatsu, Norihiko Tanno, Hiromi Sato, Noboru Yoshida
  • Patent number: 4545936
    Abstract: An aminonaphthacene derivative of the formula: ##STR1## wherein R.sup.1 is a hydrogen atom, a hydroxyl group or a lower alkoxy group, R.sup.2 is a hydrogen atom or a hydroxyl group, R.sup.3 is a hydrogen atom or a lower alkanoyl group and R.sup.4 and R.sup.5 are, same or different, each a hydrogen atom, a lower alkyl group, a lower hydroxyalkyl group or a group of the formula: ##STR2## wherein A is an alkylene group which may have one or more lower alkyl substituent(s) and R.sup.6 and R.sup.7 are, same or different, each a hydrogen atom, a lower alkyl group, a lower hydroxyalkyl group or a lower aminoalkyl group, and an acid addition salt thereof, which is useful as anti-tumor agent.
    Type: Grant
    Filed: May 4, 1984
    Date of Patent: October 8, 1985
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kikuo Ishizumi, Michihisa Muramatsu, Hiromi Sato, Norihiko Tanno, Noboru Yoshida
  • Patent number: 4540695
    Abstract: Aminonaphthacene derivatives of the formula: ##STR1## wherein A is either one of the following groups: ##STR2## wherein R.sup.1 is a hydrogen atom or a group of the formula: --COR.sup.7, R.sup.2 and R.sup.3 are each a lower alkoxy group or, when taken together, represent an ethylenedioxy group or an oxo group, R.sup.4 and R.sup.5 are both hydrogen atoms or either one of them is a hydrogen atom and the other is a group of the formula: --COR.sup.7, R.sup.6 is a hydrogen atom, a hydroxyl group or a group of the formula: --OCOR.sup.7 and R.sup.7 is a lower alkyl group, a halo(lower)alkyl group, a phenyl group or a halophenyl group, which are useful as anti-microbial and/or anti-tumor agents, or as intermediates in their production.
    Type: Grant
    Filed: August 11, 1982
    Date of Patent: September 10, 1985
    Assignee: Sumitomo Chemical Co., Ltd.
    Inventors: Kikuo Ishizumi, Naohito Ohashi, Michihisa Muramatsu