The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 13, 1981
Filed:
Dec. 18, 1978
Ake Archenholtz, Vesteras, SE;
ASEA Aktiebolag, Vesteras, SE;
Abstract
A lance is removably mounted in a powder container for injecting powder into molten metal within a furnace. The unitary connection of the lance and powder container enables vertical transport of powder as the unit is raisable and lowerable with respect to an opening in the furnace. The powder container can be filled by evacuating it and sucking powder therein. An ejector tube including a cut-off valve maintains the lance opening free from melt when the lance is immersed in the molten metal with no powder injection taking place. A hydraulic cylinder may be used to operate the ejector tube and the cut-off valve. The application of weights enables the container to maintain contact with the furnace roof.