Granted Patent
Utility
US 5,879,587 · App. 08/936,456
Terbium-activated rare earth oxysulfide phosphor with enhanced green:blue emission ratio
Inventor:
Ramon L. Yale
Patented Case
View Patent ↗
Granted: Mar 9, 1999
Filed: Sep 24, 1997
Inventor
Ramon L. Yale
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.