Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5925604 | Mild cold pearlizing concentrates | Pu Chen, Joseph H. Y. Niu | 1999-07-20 |
| 5646106 | Cold pearlizing concentrates | Pu Chen | 1997-07-08 |
| 5560873 | Mild cold pearlizing concentrates | Pu Chen, Joseph H. Y. Niu | 1996-10-01 |