Granted Patent
Utility
US 4,841,372 · App. 06/941,458
Cathode ray tube contrast enhancement systems
Inventor:
Sae D. Lee
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Dec 15, 1986
Inventor
Sae D. Lee
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.