Granted Patent
Utility
US 4,839,556 · App. 06/469,772
Cathode-ray tube having an improved shadow mask contour
Inventor:
Frank R. Ragland, Jr.
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Feb 25, 1983
Inventor
Frank R. Ragland, Jr.
Assignee (at issue)
RCA Licensing 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.