Fred Koenecke

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Nienhagen, DE

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Patents Grantslast 30 patents

Information Patent Grant
Headphones
- Patent number 7,639,832
- Issue date Dec 29, 2009
- Sennheiser electronic GmbH & Co. KG
- Wolfgang Mann
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

Patents Applicationslast 30 patents

Information Patent Application
Headphones
- Publication number 20080049963
- Publication date Feb 28, 2008
- SENNHEISER ELECTRONIC GMBH & CO. KG
- Wolfgang Mann
- H04 - ELECTRIC COMMUNICATION TECHNIQUE