Granted Patent
Utility
US 4,757,233 · App. 06/684,474
Efficient UV-emitting phosphors based on cerium-activated calcium pyrophosphate and lamps containing the same
Inventors:
Thomas E. Peters, Romano G. Pappalardo, Alexandre Vetrovs
Patented Case
View Patent ↗
Granted: Jul 12, 1988
Filed: Dec 21, 1984
Inventors
Thomas E. Peters
Romano G. Pappalardo
Alexandre Vetrovs
Assignee (at issue)
GTE Laboratories Incorporated
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.