Patents by Inventor Etsuro Itoh

Etsuro Itoh 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).

  • Pyrrolopyridazine derivatives
    Patent number: 6063782
    Abstract: Pyrrolopyridazine derivatives having the general formula. ##STR1## In the above formula, R.sup.1 represents a C.sub.2 -C.sub.6 alkenyl-group, a halogeno-C.sub.2 -C.sub.6 -alkenyl group, a C.sub.6 -C.sub.10 aryl-C.sub.2 -C.sub.6 -alkenyl group, a C.sub.2 -C.sub.6 alkynyl group, a C.sub.3 -C.sub.7 cycloalkyl group, a C.sub.3 -C.sub.7 cycloalkyl-C.sub.1 -C.sub.6 -alkyl group, a C.sub.5 -C.sub.7 cycloalkenyl-C.sub.1 -C.sub.6 -alkyl group or a halogeno-C.sub.1 -C.sub.6 -alkyl group; R.sup.2 and R.sup.3 are the same or different and each represents a hydrogen atom, a C.sub.1 -C.sub.6 alkyl group or a C.sub.6 -C.sub.10 aryl group; R.sup.4 represents a hydrogen atom or a C.sub.1 -C.sub.6 alkyl group; R.sup.5 represents a C.sub.6 -C.sub.
    Type: Grant
    Filed: July 17, 1996
    Date of Patent: May 16, 2000
    Assignees: Sankyo Company, Limited, Ube Industries, Ltd.
    Inventors: Tomio Kimura, Nobuhiko Shibakawa, Hiroshi Fujiwara, Etsuro Itoh, Keiji Matsunobu, Keiichi Tabata, Hiroshi Yasuda, Yoshimi Fujihara, deceased