Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4815516 | Method for recovering casting refractory compositions from investment casting shell molds | David H. Sturgis | 1989-03-28 |
| 4799530 | Method for recovering casting refractory compositions from investment casting slurries | David H. Sturgis | 1989-01-24 |