Granted Patent
Utility
US 4,646,138 · App. 06/715,811
Video signal recursive filter with luma/chroma separation
Inventor:
Donald H. Willis
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: Mar 25, 1985
Inventor
Donald H. Willis
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.