Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4866015 | Silica brick and process for producing same | Engelbert Overkott | 1989-09-12 |
| 4833115 | Ceramic honeycombed elongated catalyst carrier and method for production of same | Walter Hartmann, Martin Heumuller, Willi Kunkel | 1989-05-23 |