Producing Or Treating Free Metal Patents (Class 75/392)
- Foam (Class 75/415)
- Combined with step at less than 300 degrees C using nonmetallic material which is liquid under standard conditions (e.g., hydrometallurgy, etc.) (Class 75/416)
- Iron(Fe) (Class 75/433)
- Nonferrous (Class 75/585)
- Reducing or smelting unnamed ore (Class 75/707)
- Stirring or agitating of molten material (Class 75/708)
- Covering the surface of molten metal (Class 75/709)