Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6799441 | Furnaces for fused silica production | Daniel R. Sempolinski, Merrill F. Sproul | 2004-10-05 |
| 6698248 | Methods and furnaces for fused silica production | Daniel R. Sempolinski, Merrill F. Sproul | 2004-03-02 |