Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5259438 | Framed printout core for die and casting | — | 1993-11-09 |
| 4981168 | Mandrel holds expendable core in casting die | Byron W. Koch | 1991-01-01 |
| 4942917 | Expendable casting core for a cylinder | Byron W. Koch | 1990-07-24 |