Alloy for coins
Patent 4644674 Issued on February 24, 1987. Estimated Expiration Date: 
October 30, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 30, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1988938 Gold-colored coin material Method of making aureate colored coins, medallions and tokens and products so made Patent #: 4579761 InventorsAssigneeApplicationNo. 06/668274 filed on 10/30/1984US Classes:40/27.5, Coin or token type420/473, Iron, manganese or nickel containing420/476, Zinc containing428/674Cu-base componentExaminersPrimary: Rutledge, L. DewayneAssistant: Zimmerman, John J. Attorney, Agent or FirmInternational ClassesA44C 21/00 (20060101)C22C 9/04 (20060101) Foreign Application Priority Data1983-03-01 GBAbstractA coin, a coin blank or metal strip for the production of a coin or a coin blank having as its surface a copper based alloy containing between 15% and 30% (by wt) zinc, between 2% and 7% (by wt) tin and, optionally, between 2% and 7% (by wt) nickel. The alloy is gold-colored, tarnish resistant, fabricable and wear resistant.Other References
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