Granted Patent
Utility
US 4,839,728 · App. 07/029,036
Picture-in-picture video signal generator
Inventor:
Robert F. Casey
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Mar 23, 1987
Inventor
Robert F. Casey
Assignee (at issue)
RCA Licensing 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.