Granted Patent
Utility
US 4,162,421 · App. 04/840,395
Cathode ray tube having corrugated shadow mask with slits
Inventor:
Albert M. Morrell
Patented Case
View Patent ↗
Granted: Jul 24, 1979
Filed: Oct 7, 1977
Inventor
Albert M. Morrell
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.