Metal founding – Means to shape a forming surface – Pattern
Reexamination Certificate
2005-01-25
2005-01-25
Stoner, Kiley S. (Department: 1725)
Metal founding
Means to shape a forming surface
Pattern
C164S349000
Reexamination Certificate
active
06845810
ABSTRACT:
Apparatus for the gravity-cast, “lost-foam” casting of metal castings, including a fugitive, pyrolizable foam pattern forming a casting cavity in a bed of loose sand, and a hollow sprue for supplying melt to the casting cavity, wherein the sprue consists essentially of the same metal as is being cast. A high-temperature, porous vent is provided adjacent the discharge end of the metal sprue to expel air from the sprue that would otherwise be trapped therein.
REFERENCES:
patent: 4240493 (1980-12-01), Wilmarth
patent: 4452296 (1984-06-01), Amano et al.
patent: 4802527 (1989-02-01), Brockmeyer et al.
patent: 5263533 (1993-11-01), Druschitz et al.
patent: 5425410 (1995-06-01), Reynolds
patent: 6189598 (2001-02-01), Chandley et al.
patent: 6619373 (2003-09-01), Tooley et al.
U.S. Appl. No. 10/132,878, filed Apr. 25, 2002 “Lost Foam Casting Apparatus for Reducing Porosity and Inclusions in Metal Castings”.
Barendreght Jerry Allen
Hoover Mark Eugene
Siak June-Sang
Tooley Gordon Alwin
General Motors Corporation
Marra Kathryn A.
Stoner Kiley S.
Tran Len
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