Granted Patent
Utility
US 4,393,740 · App. 06/221,983
Programmable tone generator
Inventors:
Thomas A. Niezgoda, Carl Oppenheimer
Patented Case
View Patent ↗
Granted: Jul 19, 1983
Filed: Jan 2, 1981
Inventors
Thomas A. Niezgoda
Carl Oppenheimer
Assignee (at issue)
The Wurlitzer Company
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.