Granted Patent
Utility
US 4,891,548 · App. 07/199,402
Tension mask color cathode ray tube component with external registration-affording means
Inventor:
Kazimir Palac
Patented Case
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Granted: Jan 2, 1990
Filed: Nov 20, 1987
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.