Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5967779 | Abrasion hand piece for use with abrasion system | John Brassil, Shu Kun Chang, Roberto G. Fraquelli | 1999-10-19 |
| D400213 | Air abrasion hand piece | John Brassil, Shu Kun Chang, Roberto G. Fraquelli | 1998-10-27 |