Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877538 | Sulfomethylated stain blocking agents | Alexander S. Kirjanov | 1989-10-31 |
| 4865885 | Food color stain blocking fiber agents | Alexander S. Kirjanov, Vincent W. Bannigan, Jr. | 1989-09-12 |