Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4348013 | Device of refractory porous material for blowing gas into a bath of liquid metal | Roland Grave | 1982-09-07 |
| 4340208 | Refractory piece permeable to gases | Pierre Vayssiere, Charles Roederer, Roland Grave, F. Schleimer, F. Goedert +3 more | 1982-07-20 |