Johannes Wittkowski

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Schackendorf, DE

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Patents Grantslast 30 patents

Information Patent Grant
Hearing aid having plural microphones and a microphone switching sy...
- Patent number 6,327,370
- Issue date Dec 4, 2001
- Etymotic Research, Inc.
- Mead Killion
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Hearing aid having plural microphones and a microphone switching sy...
- Patent number 6,101,258
- Issue date Aug 8, 2000
- Etymotic Research, Inc.
- Mead Killion
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Hearing aid having plural microphones and a microphone switching sy...
- Patent number 5,524,056
- Issue date Jun 4, 1996
- Etymotic Research, Inc.
- Mead Killion
- H04 - ELECTRIC COMMUNICATION TECHNIQUE