Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5616160 | Process for vitrifying incinerator ash | M. Grayson Alexander, John L. Stempin | 1997-04-01 |
| 5591683 | Phase-separated, non-crystalline opal glasses | John L. Stempin | 1997-01-07 |