Melting Solid Iron(fe) Patents (Class 75/571)
- Without the use of solid, carbonaceous material (e.g., without coke, etc.) (Class 75/574)
- Using Oxygen in a higher concentration than ambient air (Class 75/575)
- Using both a solid carbonaceous fuel (e.g., coke, etc.) and a fluid (e.g, natural gas, etc.) (Class 75/576)
- Defined composition of solid fuel other than nominal "coke" (Class 75/577)
- With Calcium carbide (Class 75/578)
- With Alkali metal compound (Class 75/579)