Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874029 | Countergravity casting process and apparatus using destructible patterns suspended in an inherently unstable mass of particulate mold material | — | 1989-10-17 |
| 4862946 | Vacuum countergravity casting apparatus and method | — | 1989-09-05 |
| 4858672 | Countergravity casting apparatus and method | — | 1989-08-22 |