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:
Sep. 05, 1989
Filed:
Aug. 30, 1988
Anthony C Greanias, Saginaw, MI (US);
James B Mercer, Saginaw, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An apparatus for the vacuum, countergravity casting of molten metal includes a bottom drag member and a casting mold member thereon engaged together at a parting plane. A valve member is disposed adjacent the parting plane in an ingate to a mold cavity formed at least in part in the casting mold member and is movable between a valve seat on the bottom drag member and a stop surface on the casting mold member to permit filling of the mold cavity in countergravity manner from an underlying molten metal pool when the bottom drag member is immersed therein and to prevent backflow of the molten metal from the mold cavity when the bottom drag member is withdrawn from the pool after mold filling and before solidification of the molten metal in the mold cavity.