Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6797748 | Polyurethane based inks for writing instruments | Qingping Chen | 2004-09-28 |
| 6742952 | Transparent or translucent tubular structure | Qingping Chen | 2004-06-01 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6797748 | Polyurethane based inks for writing instruments | Qingping Chen | 2004-09-28 |
| 6742952 | Transparent or translucent tubular structure | Qingping Chen | 2004-06-01 |