Process for the separation of carbon nanotubes from graphite
Patent 5695734 Issued on December 9, 1997. Estimated Expiration Date: 
September 15, 2015. 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.
September 15, 2015. 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 ReferencesUncapped and thinned carbon nanotubes and process Process of isolating carbon nanotubes from a mixture containing carbon nanotubes and graphite particles Patent #: 5560898 InventorsAssigneeApplicationNo. 529067 filed on 09/15/1995US Classes:423/461, Recovery or purification423/445B, Fullerene (e.g., C60, C70, etc.)423/447.1Fiber, fabric, or textileExaminersPrimary: Bos, StevenAssistant: DiMauro, Peter Attorney, Agent or FirmInternational ClassesD01F 009/12C01B 031/02 Foreign Application Priority Data1994-09-27 JPAbstractA process for the isolation of carbon nanotubes from a mixture containing carbon nanotubes and graphite is disclosed, which includes the steps of:(a) reacting the mixture with a metal compound to intercalate the metal compound into the graphite;(b) reducing the reaction mixture obtained in step (a) to convert the intercalated metal compound to elemental metal;(c) heating the reduction mixture obtained in step (b) at a temperature of 450-600° C. in an oxygen-containing atmosphere to selectively oxidize the graphite and the elemental metal; and(d) contacting the heated mixture obtained in step (c) with a liquid to dissolve the oxidized metal in the liquid and to separate the carbon nanotubes as a solid phase from the oxidized metal.Other References
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