Granted Patent
Utility
US 4,388,552 · App. 06/282,228
Color picture tube having an improved expanded focus lens type inline electron gun
Inventor:
Paul T. Greninger
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: Jul 10, 1981
Inventor
Paul T. Greninger
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.