Granted Patent
Utility
US 4,590,402 · App. 06/646,095
Color picture tube having an improved expanded focus lens type inline electron gun
Inventor:
Roger C. Alig
Patented Case
View Patent ↗
Granted: May 20, 1986
Filed: Aug 31, 1984
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.