×

Coins coated with nickel, copper and nickel and process for making such coins

  • US 5,151,167 A
  • Filed: 12/04/1991
  • Issued: 09/29/1992
  • Est. Priority Date: 06/21/1990
  • Status: Expired due to Term
First Claim
Patent Images

1. A process for making a coin blank or like articles comprising:

  • a) cleaning a ferrous metal blank so that it will be essentially free of oxide;

    b) electroplating said blank with a strike of nickel;

    c) electroplating the strike of nickel with a coating of copper by first depositing a thin, initial film of copper at a low current density in a bath that is about 1/6 to 1/4 of the full current density and then depositing the remainder of the copper coating at a full current density in the same bath to minimize or avoid bridging of micropores in the ferrous metal blank.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×