Granted Patent
Utility
US 4,400,649 · App. 06/282,231
Color picture tube having an improved expanded focus lens type inline electron gun
Inventor:
Hsing-Yao Chen
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Jul 10, 1981
Inventor
Hsing-Yao Chen
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.