Granted Patent
Utility
US 4,581,561 · App. 06/450,614
High contrast cathode ray tube with integrated filter
Inventor:
Kazimir Palac
Patented Case
View Patent ↗
Granted: Apr 8, 1986
Filed: Dec 17, 1982
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.