B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
75/157
B22F 3/16 (2006.01) B22F 5/00 (2006.01) B22F 7/06 (2006.01)
Patent
CA 1086992
ABSTRACT OF THE DISCLOSURE A powder metallurgical method for the production of metallic coin blanks which are used for the coining of readily identifiable coins having particular known characteristics for protection against counter- feiting. The method comprises the formation of each coin blank component into a powder, controllably mixing said powdered components together to form a total powder mixture, pressing the total powder mixture to at least 50% of the theoretical coin blank density, and sintering at a temperature below the melting temperature of the components in a controlled atmosphere to give the coin blank.
257685
Bildstein Hubert
Machenschalk Rudolf
Schider Siegfried
Fetherstonhaugh & Co.
Metallwerk Plansee Aktiengesellschaft
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