Granted Patent
Utility
US 4,419,270 · App. 06/275,243
Oxidation catalyst
Inventors:
Michio Ueshima, Yoshiyuki Takahashi, Ritsuo Kitada, Isao Nagai
Patented Case
View Patent ↗
Granted: Dec 6, 1983
Filed: Jun 19, 1981
Inventors
Michio Ueshima
Yoshiyuki Takahashi
Ritsuo Kitada
Isao Nagai
Assignee (at issue)
Nippon Shokubai Kagaku Kogyo Co., 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.