Granted Patent
Utility
US 4,764,709 · App. 07/067,574
Top/bottom pincushion correction circuit with automatic picture tracking
Inventor:
Kirk Oliver
Patented Case
View Patent ↗
Granted: Aug 16, 1988
Filed: Jun 26, 1987
Inventor
Kirk Oliver
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.