Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D593684 | Portable electronic therapy device with capacitive circular touchpad | — | 2009-06-02 |
| 4885701 | Pen turret control system | Charles Gunderson | 1989-12-05 |
| 4849771 | Plotter pen presence and type identification system | James Lawrence | 1989-07-18 |
| 4779104 | Pen plotter pen type identification system | James Lawrence | 1988-10-18 |
| 4677572 | Pen turret control system | Charles Gunderson | 1987-06-30 |
| 4540993 | Plotter pen | Charles Gunderson | 1985-09-10 |