Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7270554 | Audio jack with plug or head set identification circuit | Mark Donaldson | 2007-09-18 |
| 6988905 | Audio jack with plug or head set identification circuit | Mark Donaldson | 2006-01-24 |
| 6411723 | Loudspeakers | Christopher Lock, Graeme Oliver Jones, Kelly Charles Waterman | 2002-06-25 |