David M. Hammelef

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Novi, MI, US

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Patents Grantslast 30 patents

Information Patent Grant
Vehicle interior active noise cancellation
- Patent number 8,045,725
- Issue date Oct 25, 2011
- GM Global Technology Operations LLC
- Mark A. Theobald
- B60 - VEHICLES IN GENERAL

Patents Applicationslast 30 patents

Information Patent Application
AUTOMOTIVE AIR DUCT CONSTRUCTION
- Publication number 20120073694
- Publication date Mar 29, 2012
- GM Global Technology Operations, Inc.
- Michael G. Leffert
- B60 - VEHICLES IN GENERAL
Information Patent Application
VEHICLE INTERIOR ACTIVE NOISE CANCELLATION
- Publication number 20100266135
- Publication date Oct 21, 2010
- GM Global Technology Operations, Inc.
- Mark A. Theobald
- B60 - VEHICLES IN GENERAL