Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7620193 | Acoustic actuators | William John Metheringham, David Johnson, Neil Munns, Martin Geoffrey Aston | 2009-11-17 |
| 6891286 | Magnetostrictive actuator | Graham Flanagan, William John Metheringham, David Johnson | 2005-05-10 |