Granted Patent
Utility
US 6,555,021 · App. 09/945,534
Preparation of ZnS:Cu,Cl electroluminescent phosphor
Inventors:
Butchi Reddy Vaddi, Shellie K. Northrop
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: Sep 1, 2001
Inventors
Butchi Reddy Vaddi
Shellie K. Northrop
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.