Granted Patent
Utility
US 4,718,099 · App. 06/823,668
Automatic gain control for hearing aid
Inventor:
David A. Hotvet
Patented Case
View Patent ↗
Granted: Jan 5, 1988
Filed: Jan 29, 1986
Inventor
David A. Hotvet
Assignee (at issue)
Telex Communications, Inc.
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.