Granted Patent
Utility
US 4,314,769 · App. 06/155,289
Acoustical tone generator
Inventor:
Edmund Hulin James, III
Patented Case
View Patent ↗
Granted: Feb 9, 1982
Filed: Jun 2, 1980
Inventor
Edmund Hulin James, III
Assignee (at issue)
International Business Machines 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.