Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6416445 | Martial arts physical interaction device and method | Mark Nelson, Raymond Puffer, Thomas P. Bonkenburg | 2002-07-09 |
| 6152863 | Martial arts physical interaction device and method | Mark Nelson, Raymond Puffer, Thomas P. Bonkenburg | 2000-11-28 |