Granted Patent
Utility
US 4,253,196 · App. 06/112,173
Frequency converter, as for first detector of heterodyne radio receiver
Inventor:
Max E. Malchow
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Jan 15, 1980
Inventor
Max E. Malchow
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.