Granted Patent
Utility
US 4,246,509 · App. 05/949,879
Gas discharge lamp with about 4 parts nitrogen and 1 part xenon
Inventors:
Jürgen Schäfer, Gunter Thomas
Patented Case
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Granted: Jan 20, 1981
Filed: Oct 10, 1978
Inventors
Jürgen Schäfer
Gunter Thomas
Assignee (at issue)
Original Hanau Quarzlampen GmbH
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.