Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5226946 | Vacuum melting/casting method to reduce inclusions | Randall S. Diehm, Robert N. Weerstra | 1993-07-13 |
| 4923508 | Segmented induction skull melting crucible and method | Randall S. Diehm | 1990-05-08 |