Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7620193 | Acoustic actuators | David Johnson, Brian Douglas Smith, Neil Munns, Martin Geoffrey Aston | 2009-11-17 |
| 7103190 | Acoustic device | David Johnson | 2006-09-05 |
| 6891286 | Magnetostrictive actuator | Graham Flanagan, David Johnson, Brian Douglas Smith | 2005-05-10 |