Issued Patents 2005
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6863843 | Naphthopyran compounds, photoresponsive compositions and lenses | Frank J. Hughes, Xuzhi Qin | 2005-03-08 |
| 6858732 | Photochromic benzodioxine fused naphthopyran compounds, compositions and articles containing those naphthopyran compounds | Xuzhi Qin | 2005-02-22 |