# US 7,410,546 B2 · Platinum alloy and method of production thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,410,546 B2 - Document ID: US7410546B2 - Status: Granted - Kind: B2 - Application number: 10/771,883 - Filed: 2004-02-04 - Published: 2005-08-04 - Granted: 2008-08-12 - Earliest claimed: 2004-02-04 - Assignees: Karat Platinum, LLC - Inventors: Peter Tews - Web page: https://patentgrep.com/patent/US7410546B2 ## CPC - A44C 27/003: {Metallic alloys (alloys in general C22C)} - C22C 5/04: Alloys based on a platinum group metal - A44C: PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS - C22C: ALLOYS (treatment of alloys C21D, C22F) ## Abstract The disclosure relates to a platinum alloy comprising (a) 55 to 63 wt. % of platinum, (b) 2 to 10 wt. % of cobalt, and (c) 27 to 43 wt. % of copper. The disclosure further relates to a platinum alloy comprising (a) 70 to 79.5 wt. % of platinum, 2 to 10. wt. % of cobalt, and (c) 10.5 to 28 wt. % of copper. The platinum alloys have excellent mechanical and optical properties for use in the production of ornamental articles such as rings, necklaces, earrings, watch bands, watch bodies and other jewelry. The disclosure further relates to a method of preparing the platinum alloys and their use in the production of ornamental articles. Still further the disclosure relates to ornamental articles comprising the platinum alloy and a method of production thereof. ## Claims ### Claim 1 A platinum alloy consisting essentially of: 55 to 63 wt. % of platinum, 2 to 10 wt. % of cobalt, and 27 to 43 wt. % of copper, wherein said alloy contains a total of 0.001 to 2 wt. % of one or more property enhancing additives selected from the group consisting of palladium, iridium and ruthenium. ### Claim 2 (depends on 1) The platinum alloy according to claim 1, wherein said alloy contains 57.5 to 59.9 wt. % of platinum. ### Claim 3 (depends on 1) The platinum alloy according to claim 1, wherein said alloy contains 58.5 to 59.0 wt. % of platinum. ### Claim 4 (depends on 1) The platinum alloy according to claim 1, wherein said alloy contains 2.0 to 8.0 wt. % of cobalt. ### Claim 5 (depends on 1) The platinum alloy according to claim 1, wherein said alloy contains 3.5 to 5.5 wt. % of cobalt. ### Claim 6 (depends on 1) The platinum alloy according to claim 1, wherein said alloy contains a total of 0.001 to 2 wt. % of one or more property enhancing additives selected from the group consisting of indium and gallium. ### Claim 7 (depends on 1) The platinum alloy according to claim 1, wherein the platinum alloy contains: 57.5 to 59.9 wt. % of platinum, 3.5 to 4.5 wt. % of cobalt, and 35.6 to 39 wt. % of copper, wherein 0.001 to 2 wt. % of copper may be substituted by one or more property enhancing additives selected from the group consisting of palladium, iridium and ruthenium, and wherein 0.001 to 2 wt. % of copper may be substituted by one or more property enhancing additives selected from the group consisting of indium and gallium. ### Claim 8 (depends on 1) The platinum alloy according to claim 1, wherein a tensile strength of said alloy is between about 450 to 800 N/mm2. ### Claim 9 (depends on 1) The platinum alloy according to claim 1, wherein an elongation at break of said alloy is at least 20%. ### Claim 10 (depends on 1) The platinum alloy according to claim 1, wherein a color tone of said alloy corresponds essentially to a platinum white color tone of a PtCu950 alloy. ### Claim 11 (depends on 1) The platinum alloy according to claim 1, wherein a Vickers hardness of said alloy, measured at soft state, is between about 130 to 210 HV10. ### Claim 12 An ornamental article comprising a platinum alloy, said platinum alloy consisting essentially of: 55 to 63 wt. % of platinum, 2 to 10 wt. % of cobalt and 27 to 43 wt. % of copper, wherein said ornamental article is selected from the group consisting of a ring, a necklace, an earring, a watch band, and a watch body. ### Claim 13 (depends on 12) The ornamental article according to claim 12, wherein said alloy contains 57.5 to 59.9 wt. % of platinum. ### Claim 14 (depends on 12) The ornamental article according to claim 12, wherein said alloy contains 58.5 to 59.0 wt. % of platinum. ### Claim 15 (depends on 12) Presented) The ornamental article according to claim 12, wherein said alloy contains 2.0 to 8.0 wt. % of cobalt. ### Claim 16 (depends on 12) The ornamental article according to claim 12, wherein said alloy contains 3.5 to 5.5 wt. % of cobalt. ### Claim 17 An ornamental article comprising a platinum alloy, said platinum alloy consisting essentially of: 55 to 63 wt. % of platinum, 2 to 10 wt. % of cobalt and 27 to 43 wt. % of copper, wherein said alloy contains a total of 0.001 to 2 wt. % of one or more property enhancing additives selected from the group consisting of palladium, iridium and ruthenium. ### Claim 18 (depends on 12) The ornamental article according to claim 12, wherein said alloy contains a total of 0.001 to 2 wt. % of one or more property enhancing additives selected from the group consisting of indium and gallium. ### Claim 19 (depends on 12) The ornamental article according to claim 12, wherein the platinum alloy contains: 57.5 to 59.9 wt. % of platinum, 3.5 to 4.5 wt. % of cobalt, and 35.6 to 39 wt. % of copper, wherein 0.001 to 2 wt. % of copper may be substituted by one or more property enhancing additives selected from the group consisting of palladium, iridium and ruthenium, and wherein 0.001 to 2 wt. % of copper may be substituted by one or more property enhancing additives selected from the group consisting of indium and gallium. ### Claim 20 (depends on 12) The ornamental article according to claim 12, wherein a tensile strength of said alloy is between about 450 to 800 N/mm2. ### Claim 21 (depends on 12) The ornamental article according to claim 12, wherein an elongation at break of said alloy is at least 20%. ### Claim 22 (depends on 12) The ornamental article according to claim 12, wherein a color tone of said alloy corresponds essentially to a platinum white color tone of a PtCu950 alloy. ### Claim 23 (depends on 12) The ornamental article according to claim 12, wherein a Vickers hardness of said alloy, measured at soft state, is between about 130 to 210 HV10. ### Claim 24 A method of preparing a platinum alloy, comprising the steps of: providing alloy components, said alloy components consisting essentially of: 55 to 63 wt. % of platinum, 2 to 10 wt. % of cobalt, and 27 to 43 wt. % of copper; blending the alloy components together; and melting the alloy components to form said alloy, wherein said alloy contains a total of 0.001 to 2 wt. % of one or more property enhancing additives selected from the group consisting of palladium, iridium and ruthenium. ### Claim 25 (depends on 24) The method according to claim 24, wherein said alloy contains 57.5 to 59.9 wt. % of platinum. ### Claim 26 (depends on 24) The method according to claim 24, wherein said alloy contains 58.5 to 59.0 wt. % of platinum. ### Claim 27 (depends on 24) The method according to claim 24, wherein said alloy contains 2.0 to 8.0 wt. % of cobalt. ### Claim 28 (depends on 24) The method according to claim 24, wherein said alloy contains 3.5 to 5.5 wt. % of cobalt. ### Claim 29 (depends on 24) The method according to claim 24, wherein said alloy contains a total of 0.001 to 2 wt. % of one or more property enhancing additives selected from the group consisting of indium and gallium. ### Claim 30 (depends on 24) The method according to claim 24, wherein the platinum alloy contains: 57.5 to 59.9 wt. % of platinum, 3.5 to 4.5 wt. % of cobalt, and 35.6 to 39 wt. % of copper, wherein 0.001 to 2 wt. % of copper may be substituted by one or more property enhancing additives selected from the group consisting of palladium, iridium and ruthenium, and wherein 0.001 to 2 wt. % of copper may be substituted by one or more property enhancing additives selected from the group consisting of indium and gallium. ### Claim 31 (depends on 24) The method according to claim 24, wherein a tensile strength of said alloy is between about 450 to 800 N/mm2. ### Claim 32 (depends on 24) The method according to claim 24, wherein an elongation at break of said alloy is at least 20%. ### Claim 33 (depends on 24) The method according to claim 24, wherein a color tone of said alloy corresponds essentially to a platinum white color tone of a PtCu950 alloy. ### Claim 34 (depends on 24) The method according to claim 24, wherein a Vickers hardness of said alloy, measured at soft state, is between about 130 to 210 HV10.