Patents by Inventor Mikayo Kamata

Mikayo Kamata 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).

  • Pyrido(3,2,1-IJ)-1,3,4-benzoxadiazine derivatives
    Patent number: 4864023
    Abstract: The invention is concerned with tricyclic compounds of the formula ##STR1## wherein R.sup.1 is a hydrogen atom or a carboxy-protecting radical; R.sup.2 is a hydrogen atom or a lower alkyl radical which may be substituted with a halogen atom; R.sup.3 and R.sup.4 independently are a hydrogen atom or a lower alkyl radical which may be substituted with a hydroxy radical or a substituted or unsubstituted amino radical; X is a halogen atom; and R.sup.5 and R.sup.6 are independently a hydrogen atom or a lower alkyl radical which may be substituted with a hydroxy radical, a lower alkoxy radical or a substituted or unsubstituted amino radical; or R.sup.5 and R.sup.6, taken together with the adjacent nitrogen atom, may form a 5 to 7 membered heterocyclic ring which may be substituted with one or more substituents at the carbon atom(s), and the heterocyclic ring may further contain --NR.sup.7 --, --O--, --S--, --SO--, --SO.sub.2 -- or --NR.sup.7 --CO--, and also R.sup.
    Type: Grant
    Filed: August 26, 1988
    Date of Patent: September 5, 1989
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Kazuteru Yokose, Nobuo Shimma, Mikayo Kamata, Masahiro Aoki, Tatsuo Ohtsuka