Granted Patent
Utility
US 4,295,161 · App. 06/142,031
Keyed noise filter in a television receiver
Inventor:
James Hettiger
Patented Case
View Patent ↗
Granted: Oct 13, 1981
Filed: Apr 21, 1980
Inventor
James Hettiger
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.