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US 4,063,346 AGranted
Silver color proof coin or medal and method of making the same
AssigneeFranklin Mint Company
InventorsJames W. Simpson, Andrew Cosgarea, Jr., Richard D. Bankert
Life of this patent
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Abstract
A silver color coin or medal is produced from a copper-silver alloy containing from about 30 to 60% by weight of silver. The normal rose color caused by the copper in the alloy is removed by selective electrolytic etching.
Claims14
A method of making a silver color proof coin or medal from a copper-silver alloy comprising the steps of:
- a. producing a copper-silver alloy wherein the silver component is from 30 to 60 weight percent of said alloy;
- b. forming a coin blank from said alloy;
- c. electrolytically etching said coin blank for a sufficient time to remove a sufficient amount of copper from the surfaces of said coin blank to produce a coin blank having a silver surface color;
- d. burnishing said electrolytically etched coin blank;
- and
- e. coining said coin blank in a highly polished die.
3 more elements
Dependencies are inferred from the claim text.