Granted Patent
Utility
US 6,181,058 · App. 09/190,187
Cathode in electron tube with actinoid metal(s) or compound(s) thereof
Inventor:
Gyeong Sang Lee
Patented Case
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Granted: Jan 30, 2001
Filed: Nov 12, 1998
Inventor
Gyeong Sang Lee
Assignee (at issue)
LG ELECTRONICS INC.
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.