Granted Patent
Utility
US 4,014,813 · App. 05/539,906
Hafnium pyrophosphate phosphors and methods of preparation
Inventor:
Igal Shidlovsky
Patented Case
View Patent ↗
Granted: Mar 29, 1977
Filed: Jan 13, 1975
Inventor
Igal Shidlovsky
Assignee (at issue)
RCA 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.