Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886539 | Method of vacuum refining of glassy materials with selenium foaming agent | Richard L. Gerutti, David R. Haskins, Robert B. Heithoff, Ronald L. Schwenninger | 1989-12-12 |
| 4794860 | Foam control method for vacuum refining of glassy materials | — | 1989-01-03 |