| 7492918 |
Audio speaker with graduated voice coil windings |
Richard Calderwood |
2009-02-17 |
| 7477757 |
Dual-gap transducer with radially-charged magnet |
— |
2009-01-13 |
| 7457429 |
Laminated motor structure for electromagnetic transducer |
— |
2008-11-25 |
| 7270215 |
Loudspeaker enclosure with damping material laminated within internal shearing brace |
— |
2007-09-18 |
| 7233681 |
Electromagnetic transducer with eccentrically mounted voice coil former |
Patrick M. Tummire, Richard Calderwood |
2007-06-19 |
| 7227970 |
Shorting ring fixture for electromagnetic transducer |
Richard Calderwood |
2007-06-05 |
| 7181039 |
Thermal chimney equipped audio speaker cabinet |
Richard Calderwood |
2007-02-20 |
| 7177440 |
Electromagnetic transducer with asymmetric diaphragm |
Patrick Turnmire, Richard Calderwood |
2007-02-13 |
| 7065225 |
Electromagnetic transducer having a low reluctance return path |
— |
2006-06-20 |
| 7031487 |
Tabbed speaker frame with oversized diaphragm |
— |
2006-04-18 |
| 7006654 |
Push-pull electromagnetic transducer with increased Xmax |
Richard Calderwood |
2006-02-28 |
| 6996247 |
Push-push multiple magnetic air gap transducer |
— |
2006-02-07 |
| 6940992 |
Push-push multiple magnetic air gap transducer |
— |
2005-09-06 |
| 6917690 |
Electromagnetic transducer having multiple magnetic air gaps whose magnetic flux is in a same direction |
— |
2005-07-12 |