Granted Patent
Utility
US 5,122,710 · App. 07/442,227
Rare earth phosphor blends for fluorescent lamp using four to five phosphors
Inventors:
Donald P. Northrop, Gerald Schiazzano
Patented Case
View Patent ↗
Granted: Jun 16, 1992
Filed: Nov 28, 1989
Inventors
Donald P. Northrop
Gerald Schiazzano
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.