Granted Patent
Utility
US 4,971,968 · App. 06/679,056
Pyridazinone derivatives and salts thereof
Inventors:
Hiromi Okushima, Akihiro Narimatsu, Makio Kobayashi, Isao Shimooda, Yoshimi Kitada
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Dec 6, 1984
Inventors
Hiromi Okushima
Akihiro Narimatsu
Makio Kobayashi
Isao Shimooda
Yoshimi Kitada
Assignee (at issue)
Mitsubishi Kasei Corporation
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.