Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6309023 | Energy absorbing torsion bar seat belt retractor with sharp onset property | Simon Xunnan He | 2001-10-30 |
| 6158816 | Energy absorbing torsion bar seat belt retractor with sharp onset property | Simon Xunnan He | 2000-12-12 |