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:
Oct. 09, 1990
Filed:
Jun. 08, 1989
Howard R Harker, Malvern, PA (US);
Axel Johnson Metals, Inc., Lionville, PA (US);
Abstract
In the particular embodiments of the invention described in the specification, a hearth for melting and refining metal has a hearth bed with cooling pipes so that a skull of molten metal is formed and energy input devices are directionally controlled to permit the skull to form a barrier between a melting region where solid material is introduced into the hearth and a refining region where molten material is refined before being poured into a mold. In one embodiment, the barrier formed by the skull provides a dam with a narrow channel between the melting region and the refining region, and in another form, the barrier provided by the skull consists of spaced peninsulas extending from opposite sides of the hearth to provide a serpentine path between the melting region and the refining region.