Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4821701 | Purge corruption detection | Douglas C. Frantz, James R. Tamm, Terry R. Gutermuth | 1989-04-18 |
| 4809761 | Process for producing molds or cores for investment casting with reduced solvent loss | E. Richard Randolph | 1989-03-07 |