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David Graebener
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Carson City, NV, US
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Patents Grants
last 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 Applications
last 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