Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5691061 | Refractory shape having an external layer capable of forming a layer impermeable to gases and process for its preparation | Eric Hanse | 1997-11-25 |
| 5681499 | Method and compositions for making refractory shapes having dense, carbon free surfaces and shapes made therefrom | Paul M. Benson, Duane L. Debastiani, Quentin K. Robinson, David Stephenson, Eric Hanse | 1997-10-28 |