Process and immersion lances for introducing oxygen into a metal melt
Patent 3945820 Issued on March 23, 1976. Estimated Expiration Date: 
March 23, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 23, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1968917 3330645 3706549 3771998 InventorsAssigneeApplicationNo. 447422 filed on 03/01/1974US Classes:75/10.41, Producing or treating Iron(Fe) or Iron alloy266/217, Gaseous treating material266/225, Lance75/516, Using gaseous Oxygen in a higher concentration than in ambient air75/530And hydrocarbon in surrounding relationship to gaseous Oxygen (e.g., hydrocarbon in outer concentric tube, etc.)ExaminersPrimary: Rosenberg, Peter D.Attorney, Agent or FirmForeign Application Priority Data1973-03-03 DTAbstractImmersion lances for refining metal melts in hearth type vessels including open hearth and electric furnaces. The lances are movable into and out of the metal melt and comprise an oxygen pipe, a cooling medium pipe surrounding the oxygen pipe and a refractory casing which is wear resistant, temperature resistant and chemically resistant to the operating surroundings. The process of refining using such lances is also described. | |
