Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6517619 | Fluorescent inks for writing instruments using fluorescent dyes and white pigments | Qingping Chen | 2003-02-11 |
| 6503965 | Solvent-based non-fluorescent ink for writing instruments based upon pigment dispersions in non-aqueous solvents | Qingping Chen | 2003-01-07 |