David Graebener

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Carson City, NV, US

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Patents Grantslast 30 patents

Information Patent Grant
Single end planar magnetic speaker
- Patent number 7,251,342
- Issue date Jul 31, 2007
- American Technology Corporation
- David Graebener
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Single-ended planar-magnetic speaker
- Patent number 7,142,688
- Issue date Nov 28, 2006
- American Technology Corporation
- James J. Croft, III
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Planar-magnetic speakers with secondary magnetic structure
- Patent number 6,934,402
- Issue date Aug 23, 2005
- American Technology Corporation
- James J. Croft, III
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Planar-magnetic speakers with secondary magnetic structure
- Publication number 20090097693
- Publication date Apr 16, 2009
- James J. Croft, III
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Single-ended planar-magnetic speaker
- Publication number 20070127767
- Publication date Jun 7, 2007
- AMERICAN TECHNOLOGY CORPORATION
- James J. Croft
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Planar-magnetic speakers with secondary magnetic structure
- Publication number 20060050923
- Publication date Mar 9, 2006
- American Technology Corporation
- James J. Croft
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Single end planar magnetic speaker
- Publication number 20030228029
- Publication date Dec 11, 2003
- David Graebener
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Single-ended planar-magnetic speaker
- Publication number 20020191808
- Publication date Dec 19, 2002
- American Technology Corporation
- James J. Croft
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Planar-magnetic speakers with secondary magnetic structure
- Publication number 20020118856
- Publication date Aug 29, 2002
- American Technology Corporation
- James J. Croft
- H04 - ELECTRIC COMMUNICATION TECHNIQUE