Granted Patent
Utility
US 4,850,962 · App. 07/165,594
Implantable hearing aid and method of improving hearing
Inventor:
Donald W. Schaefer
Patented Case
View Patent ↗
Granted: Jul 25, 1989
Filed: Mar 8, 1988
Inventor
Donald W. Schaefer
Assignee (at issue)
Medical Devices, 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.