Granted Patent
Utility
US 4,178,531 · App. 05/806,717
CRT with field-emission cathode
Inventor:
Roger C. Alig
Patented Case
View Patent ↗
Granted: Dec 11, 1979
Filed: Jun 15, 1977
Inventor
Roger C. Alig
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.