Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8009857 | Induction motor for loudspeaker | Jack T. Bohlender, Thilo Christian Stompler, David J. Michno, Robert Smith | 2011-08-30 |
| 7251342 | Single end planar magnetic speaker | — | 2007-07-31 |
| 7142688 | Single-ended planar-magnetic speaker | James J. Croft, III | 2006-11-28 |
| 6934402 | Planar-magnetic speakers with secondary magnetic structure | James J. Croft, III | 2005-08-23 |