Douglas Walter Hansen

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Caledon East, CA

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Patents Grantslast 30 patents

Information Patent Grant
Speaker
- Patent number 8,036,414
- Issue date Oct 11, 2011
- John B. French
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Audio amplifier
- Patent number 7,362,168
- Issue date Apr 22, 2008
- Audera International Sales Inc.
- John B. French
- H03 - BASIC ELECTRONIC CIRCUITRY

Patents Applicationslast 30 patents

Information Patent Application
SPEAKER
- Publication number 20080118097
- Publication date May 22, 2008
- John B. French
- H03 - BASIC ELECTRONIC CIRCUITRY