Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880947 | Vacuum interrupter with simplified enclosure and method of assembly | William J. Lange, Carl B. Freidhoff, Paul G. Slade | 1989-11-14 |
| 4802919 | Method for processing oxidic materials in metallurgical waste | — | 1989-02-07 |