Granted Patent
Utility
US 5,309,071 · App. 08/135,044
Zinc sulfide electroluminescent phosphor particles and electroluminescent lamp made therefrom
Inventors:
Ronald E. Karam, Aaron Wold
Patented Case
View Patent ↗
Granted: May 3, 1994
Filed: Oct 12, 1993
Inventors
Ronald E. Karam
Aaron Wold
Assignee (at issue)
OSRAM SYLVANIA 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.