Granted Patent
Utility
US 4,623,250 · App. 06/530,122
DC plasma jet generator for emission spectrochemical analysis
Inventors:
Koichi Onishi, Takashi Suganuma
Patented Case
View Patent ↗
Granted: Nov 18, 1986
Filed: Sep 7, 1983
Inventors
Koichi Onishi
Takashi Suganuma
Assignee (at issue)
Doryokuro Kakunenryo Kaihatsu Jigyodan
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.