Granted Patent
Utility
US 4,581,643 · App. 06/516,933
Double conversion television tuner with frequency response control provisions
Inventor:
David J. Carlson
Patented Case
View Patent ↗
Granted: Apr 8, 1986
Filed: Jul 25, 1983
Inventor
David J. Carlson
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.