Granted Patent
Utility
US 4,687,972 · App. 06/833,149
Raster distortion correction circuitry for a video display apparatus that includes a square-planar picture tube
Inventor:
Peter E. Haferl
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: Feb 27, 1986
Inventor
Peter E. Haferl
Assignee (at issue)
RCA Corporation
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.