Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D328293 | Radio telephone transceiver | William Mak, Fernd van Engelen | 1992-07-28 |
| D317156 | Portable handheld telephone | Fernd van Engelen, William Mak | 1991-05-28 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D328293 | Radio telephone transceiver | William Mak, Fernd van Engelen | 1992-07-28 |
| D317156 | Portable handheld telephone | Fernd van Engelen, William Mak | 1991-05-28 |