Granted Patent
Utility
US 4,239,939 · App. 06/018,905
Stereophonic sound synthesizer
Inventor:
Patrick D. Griffis
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Mar 9, 1979
Inventor
Patrick D. Griffis
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.