Martin Sessler

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Darmstadt, DE

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Patents Grantslast 30 patents

Information Patent Grant
Unidirectional second order gradient microphone
- Patent number 4,742,548
- Issue date May 3, 1988
- American Telephone and Telegraph Company
- Martin Sessler
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Second order toroidal microphone
- Patent number 4,675,906
- Issue date Jun 23, 1987
- AT&T Company, AT&T Bell Laboratories
- Martin Sessler
- H04 - ELECTRIC COMMUNICATION TECHNIQUE