Granted Patent
Utility
US 4,723,167 · App. 07/018,147
Turn-off circuit for projection television CRT
Inventor:
Donald E. Griffey
Patented Case
View Patent ↗
Granted: Feb 2, 1988
Filed: Feb 24, 1987
Inventor
Donald E. Griffey
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.