Granted Patent
Utility
US 4,724,487 · App. 07/015,407
Interlace inversion detector for a picture-in-picture video signal generator
Inventor:
Robert F. Casey
Patented Case
View Patent ↗
Granted: Feb 9, 1988
Filed: Feb 17, 1987
Inventor
Robert F. Casey
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.