Copper alloy clad for coinage

There is provided a metallic composite useful for coinage. The core is formed from a copper alloy that contains between 50% and 99.0% copper, has a room temperature electrical conductivity in excess of 25% IACS an initial yield strength in excess of 10,000 psi and a dynamic softening response onset...

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Bibliographic Details
Main Authors TYLER; DEREK E, BREEDIS; JOHN F
Format Patent
LanguageEnglish
Published 05.12.1995
Edition6
Subjects
CLADDING OR PLATING BY SOLDERING OR WELDING
CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING
GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC
GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS
LAYERED PRODUCTS
LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
SOLDERING OR UNSOLDERING
TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
TECHNICAL SUBJECTS COVERED BY FORMER USPC
TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
TRANSPORTING
WELDING
WORKING BY LASER BEAM
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Summary:There is provided a metallic composite useful for coinage. The core is formed from a copper alloy that contains between 50% and 99.0% copper, has a room temperature electrical conductivity in excess of 25% IACS an initial yield strength in excess of 10,000 psi and a dynamic softening response onset at a temperature in the range of 200 DEG C.-400 DEG C. The cladding layers have an initial yield strength more than that of the core and a gold color. The strengthening response of the core during cladding is similar to that of the cladding layers making the metallic composites resistant to corrugation. Reducing corrugation increases the sensitivity of electromagnetic coin discriminators.
Bibliography:Application Number: US19950372272