CA1093498-A2: Process for the Production of Coin Blanks

The basis behind this invention revolves around producing coin blanks, which can then be used to mint coins. Typically speaking, most coins have a common core that is comprised of an economical material, while the outer layer features a more expensive face. Before this invention existed, the cheaper core was visible around the coin's perimeter. Aside from aesthetic disadvantages, this exposure of core material can make coins vulnerable to corrosion and degradation. However, this invention allows for a drastic improvement in annealing high quality coin blanks at a commercial scale. By loading metallic pieces of the core material into an inert perforated cylinder and electroplating this container in a bath with an anode, metal is deposited on both faces of the core material. After electroplating, these pieces are annealed in a furnace at temperatures of 800 to 1000 degrees to strength the bond between the core material and the outer metallic cladding. After the annealing process is complete, coin blanks are ready for minting. In addition to coins, this method also applies to medallions and tokens as well.

Link to Official Patent: Process for the Production of Coin Blanks

Keyword: Annealing