Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4730754 | Refractory immersion tube providing laminar flow of molten metal | Heinz Buhr, Manfred Winkelmann | 1988-03-15 |
| 4331471 | Method and device for installing and replacing a gas permeable insert in the wall of a vessel and for the introduction of gas therethrough | Wilhelm Langenfeld | 1982-05-25 |