Granted Patent
Utility
US 4,293,792 · App. 06/104,828
Color picture tube having improved slit type shadow mask
Inventor:
Donald L. Roberts
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Dec 18, 1979
Inventor
Donald L. Roberts
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.