Stock material or miscellaneous articles – Three dimension imitation or 'treated' natural product
Patent
1996-05-08
1998-12-29
Zimmerman, John J.
Stock material or miscellaneous articles
Three dimension imitation or 'treated' natural product
428544, 428613, 164132, 164138, B22D 2502, B22D 2900
Patent
active
058538259
ABSTRACT:
A free-form metal casting that simulates a natural metal nugget, and method of casting the same. Molten metal is poured into a recess in an upper surface of a bed of rock salt. While still molten, portions of the metal variously penetrate downward through the rock salt, thereby forming, as the metal cools, a unique casting having a random pattern of stalagmite extensions. The surfaces of the casting have a pitted, grainy texture impressed by the rock salt, which simulates the appearance of naturally occurring precious metal nuggets. Surface metal oxides are removed from the casting by electrofinishing. Cast nuggets of copper, brass and bronze are preferably electroplated with gold or silver. After polishing, the cast nuggets are suitable for use in jewelry and decorative art objects.
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Coyne Brian J.
Zimmerman John J.
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