John Fredrickson

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Clayton, MO, US

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Patents Grantslast 30 patents

Information Patent Grant
Implantable hearing aid coupler device
- Patent number 5,085,628
- Issue date Feb 4, 1992
- Storz Instrument Company
- A. Maynard Engebretson
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Implantable middle ear hearing aid system and acoustic coupler ther...
- Patent number 4,988,333
- Issue date Jan 29, 1991
- Storz Instrument Company
- A. Maynard Engebretson
- H04 - ELECTRIC COMMUNICATION TECHNIQUE