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:
Jul. 13, 1993
Filed:
May. 29, 1992
Randall S Diehm, Whitehall, MI (US);
Robert N Weerstra, Muskegon, MI (US);
Blake K Zuidema, Farmington Hills, MI (US);
Howmet Corporation, Greenwich, CT (US);
Abstract
In the melting of one or successive alloy charges including one or more volatile alloying elements, each alloy charge is melted in a melting vessel under an inert gas partial pressure effective to reduce volatilization, migration and condensation of the volatile alloying elements and build-up of condensate deposits of the volatile elements on cool regions of the melting vessel and melting chamber where the deposits constitute inclusion precursors that can eventually enter successive charges melted in the vessel. Wetting of the crucible by the melt is also reduced by the gas partial pressure. The incidence of inclusions found in castings produced from the successive melts is thereby reduced.