Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4943425 | Method of making high purity dense silica of large particle size | Sophia R. Su | 1990-07-24 |
| 4940571 | Method of making large particle size, high purity dense silica | Sophia R. Su, Sheryl A. Robillard | 1990-07-10 |