Patents by Inventor James W. Simpson

James W. Simpson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Silver color proof coin or medal and method of making the same
    Patent number: 4063346
    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.
    Type: Grant
    Filed: April 29, 1976
    Date of Patent: December 20, 1977
    Assignee: Franklin Mint Corporation
    Inventors: James W. Simpson, Andrew Cosgarea, Jr., Richard D. Bankert