Granted Patent
Utility
US 4,772,417 · App. 06/684,680
Process for preparing high-brightness yellow-emitting triboluminescent phosphors
Inventors:
Romano G. Pappalardo, Thomas E. Peters
Patented Case
View Patent ↗
Granted: Sep 20, 1988
Filed: Dec 21, 1984
Inventors
Romano G. Pappalardo
Thomas E. Peters
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.