Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6802870 | Method for imparting soil and stain resistance to carpet | John C. H. Chang | 2004-10-12 |
| 6736857 | Method for imparting soil and stain resistance to carpet | John C. H. Chang | 2004-05-18 |