Granted Patent
Utility
US 4,891,550 · App. 07/346,317
Phosphor blend for broad spectrum fluorescent lamp
Inventors:
Donald P. Northrop, Gerald Schiazzano, Arpad Pirovic
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: May 1, 1989
Inventors
Donald P. Northrop
Gerald Schiazzano
Arpad Pirovic
Assignee (at issue)
Duro-Test 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.