Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862945 | Vacuum countergravity casting apparatus and method with backflow valve | James B. Mercer | 1989-09-05 |
| 4809767 | Countergravity casting apparatus | Karl D. Voss, James B. Mercer | 1989-03-07 |