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US 4,499,940 AGranted
Casting process including making and using an elastomeric pattern
AssigneeWilliams International Corporation
InventorRobert T. Hall
Life of this patent
Estimating the term…
Abstract
A casting process for making and utilizing an elastomeric pattern that is coated with a non-metallic material to form a non-metallic shell mold and thereafter removed from the non-metallic shell mold by thermal decomposition or mechanical stripping.
Claims10
A casting process comprising the steps of
- fabricating a master pattern from an electrically conductive material,
- plating said master pattern with a metal,
- chemically dissolving said master pattern to leave a metallic shell mold,
- reinforcing said metallic shell mold exteriorly thereof,
- pouring an elastomeric compound into said metallic shell mold to form an elastomeric pattern,
- stripping the elastomeric pattern from said metallic shell mold,
- coating said elastomeric pattern with a non-metallic material to form a non-metallic shell mold,
- removing said elastomeric pattern from said non-metallic shell mold,
- pouring a metal into said non-metallic shell mold to form a metallic casting, and
- retrieving said metallic casting from said non-metallic shell mold by destroying said non-metallic shell mold.
7 more elements
Dependencies are inferred from the claim text.