Granted Patent
Utility
US 4,335,470 · App. 06/201,829
Audio de-emphasis circuit
Inventors:
James C. Marsh, Jr., Marcus Snell
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Oct 29, 1980
Inventors
James C. Marsh, Jr.
Marcus Snell
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.