Peter Heitkamper

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Grosszimmern, DE

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Patents Grantslast 30 patents

Information Patent Grant
Method of improving sidetone attenuation in electroacoustic systems
- Patent number 5,467,394
- Issue date Nov 14, 1995
- Alcatel N.V.
- Michael Walker
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Circuit arrangement for controlling the volume range of a voice ter...
- Patent number 5,359,653
- Issue date Oct 25, 1994
- Alcatel N.V.
- Michael Walker
- H04 - ELECTRIC COMMUNICATION TECHNIQUE