Granted Patent
Utility
US 4,656,389 · App. 06/791,177
Tensed mask cathode ray tube
Inventor:
Kazimir Palac
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Oct 25, 1985
Inventor
Kazimir Palac
Assignee (at issue)
Zenith Electronics LLC
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.