Inventor

GRAEBENER DAVID

US3 patents

Patents

3 patents

US7142688B2Nov 28, 2006

Single-ended planar-magnetic speaker

AMERICAN TECH CORP24 citations90

US6934402B2Aug 23, 2005

Planar-magnetic speakers with secondary magnetic structure

AMERICAN TECH CORP33 citations90

US7251342B2Jul 31, 2007

Single end planar magnetic speaker

AMERICAN TECH CORP16 citations79