Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5911269 | Method of making silica sand molds and cores for metal founding | Ronald M. Kotschi | 1999-06-15 |
| 4735973 | Additive for sand based molding aggregates | — | 1988-04-05 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5911269 | Method of making silica sand molds and cores for metal founding | Ronald M. Kotschi | 1999-06-15 |
| 4735973 | Additive for sand based molding aggregates | — | 1988-04-05 |