Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877656 | Method of fabricating simulated stone surfaces and improved simulated stone product | — | 1989-10-31 |
| 4859674 | Pyrazine in prevention and treatment of strokes | Dominic Man-Kit Lam | 1989-08-22 |