Method for refining molten metal bath to control nitrogen
Patent 4615730 Issued on October 7, 1986. Estimated Expiration Date: 
April 30, 2005. 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.
April 30, 2005. 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 16082 Re29584 3891429 Decarburizing molten metal Patent #: 4260415 InventorAssigneeApplicationNo. 06/729002 filed on 04/30/1985US Classes:420/71, Processes75/543, Elemental metal or elemental Silicon(Si)75/546, Noble gas or inert gas not otherwise identified75/554, Including other gas from above75/557Including other gas from belowExaminersPrimary: Rosenberg, Peter D.Attorney, Agent or FirmInternational ClassesC21C 5/00 (20060101)C21C 7/068 (20060101) AbstractA method for refining a molten metal bath is provided including introducing a refining gas containing substantially a combination of oxygen and nitrogen to the molten bath to reduce the carbon content of the bath to a selected level; thereafter an inert gas, such as argon, is introduced to the molten bath from a lance adapted to direct the inert gas onto or beneath the bath surface, whereby the inert gas serves to efficiently remove nitrogen from the bath. | |
