Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889540 | Apparatus for determination of slag tap blockage | Clifford C. Segerstrom, Jacob H. Stil, Pieter J. Schuurman | 1989-12-26 |
| 4869622 | Feed hopper design | James A. Salter, James J. McCusker, Charles M. Arbore, Hendricus A. Dirkse, Rudi Everts +2 more | 1989-09-26 |
| 4834778 | Determination of slag tap blockage | Clifford C. Segerstrom, Jacob H. Stil, Pieter J. Schuurman | 1989-05-30 |