Graebener; David
Patent Applications and Registrations
Patent applications and USPTO patent grants for Graebener; David.The latest application filed is for "planar-magnetic speakers with secondary magnetic structure".
- Graebener; David - Carson City NV
Trademarks
| Patent | Date |
|---|---|
| Planar-magnetic speakers with secondary magnetic structure App 20090097693 - Croft, III; James J. ; et al. | 2009-04-16 |
| Single end planar magnetic speaker Grant 7,251,342 - Graebener July 31, 2 | 2007-07-31 |
| Single-ended planar-magnetic speaker App 20070127767 - Croft; James J. III ; et al. | 2007-06-07 |
| Single-ended planar-magnetic speaker Grant 7,142,688 - Croft, III , et al. November 28, 2 | 2006-11-28 |
| Planar-magnetic speakers with secondary magnetic structure App 20060050923 - Croft; James J. III ; et al. | 2006-03-09 |
| Planar-magnetic speakers with secondary magnetic structure Grant 6,934,402 - Croft, III , et al. August 23, 2 | 2005-08-23 |
| Single end planar magnetic speaker App 20030228029 - Graebener, David | 2003-12-11 |
| Single-ended planar-magnetic speaker App 20020191808 - Croft, James J. III ; et al. | 2002-12-19 |
| Planar-magnetic speakers with secondary magnetic structure App 20020118856 - Croft, James J. III ; et al. | 2002-08-29 |
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