Donald W. Schaefer

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Belleville, WI, US

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Patents Grantslast 30 patents

Information Patent Grant
Implantable hearing aid and method of improving hearing
- Patent number 4,850,962
- Issue date Jul 25, 1989
- Medical Devices Group, Inc.
- Donald W. Schaefer
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Implantable hearing aid and method of improving hearing
- Patent number 4,729,366
- Issue date Mar 8, 1988
- Medical Devices Group, Inc.
- Donald W. Schaefer
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE