Granted Patent
Utility
US 4,822,797 · App. 07/026,758
Piperazinyl carbonyl phenyl pyridazinone derivatives useful as cardiotonics
Inventors:
Hiromi Okushima, Akihiro Narimatsu, Makio Kobayashi, Rikizo Furuya, Yoshimi Kitada
Patented Case
View Patent ↗
Granted: Apr 18, 1989
Filed: Mar 31, 1987
Inventors
Hiromi Okushima
Akihiro Narimatsu
Makio Kobayashi
Rikizo Furuya
Yoshimi Kitada
Assignee (at issue)
Mitsubishi Chemical Industries, Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.