Granted Patent
Utility
US 4,348,359 · App. 06/270,231
Device for determining various types of trace nitrogen
Inventors:
Tomonori Kojima, Yasumitsu Katsuno
Patented Case
View Patent ↗
Granted: Sep 7, 1982
Filed: Jun 4, 1981
Inventors
Tomonori Kojima
Yasumitsu Katsuno
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.