Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6152159 | Valve assembly and method for use in delivery of molten metal | Norman L. Miller | 2000-11-28 |
| 5725043 | Low pressure casting process and apparatus | Carl W. D. Schaefer, James Michael Williamson, Norman L. Miller | 1998-03-10 |
| 5590681 | Valve assembly | Carl W. D. Schaefer, James Michael Williamson, Norman L. Miller | 1997-01-07 |