Granted Patent
Utility
US 4,285,990 · App. 06/172,220
Method for coating a selected portion of the internal neck surface of a CRT
Inventor:
Karl G. Hernqvist
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Jul 25, 1980
Inventor
Karl G. Hernqvist
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.