Granted Patent
Utility
US 5,223,341 · App. 07/704,496
Phosphor containing barium and lead
Inventor:
A. Gary Sigai
Patented Case
View Patent ↗
Granted: Jun 29, 1993
Filed: May 23, 1991
Inventor
A. Gary Sigai
Assignee (at issue)
GTE Products Corporation
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.