Granted Patent
Utility
US 5,294,368 · App. 07/999,243
Method of making a composite electroluminescent phosphor
Inventors:
Ronald E. Karam, Richard G. W. Gingerich
Patented Case
View Patent ↗
Granted: Mar 15, 1994
Filed: Dec 31, 1992
Inventors
Ronald E. Karam
Richard G. W. Gingerich
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.