Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5421561 | Gas stir devices with refractory material erosion depth indicator and method of making the same | Eckehard Eisermann | 1995-06-06 |
| 5330160 | Gas stir plug wear indicator including low melting point component and method of use | Eckehard Eisermann | 1994-07-19 |