Process for purifying, uncapping and chemically modifying carbon nanotubes
Patent 5698175 Issued on December 16, 1997. Estimated Expiration Date: 
July 3, 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.
July 3, 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 ReferencesTreatment of carbon fibers Process for the surface treatment of carbon fibers Process for production of a carbon filament Uncapped and thinned carbon nanotubes and process Patent #: 5346683 InventorsAssigneeApplicationNo. 497895 filed on 07/03/1995US Classes:423/447.1, Fiber, fabric, or textile423/445B, Fullerene (e.g., C60, C70, etc.)423/460, Treating carbon423/461Recovery or purificationExaminersPrimary: Bos, StevenAssistant: DiMauro, Peter Attorney, Agent or FirmForeign Patent References
International ClassesC01B 031/00D01F 009/12 Foreign Application Priority Data1994-07-05 JPAbstractDisclosed is a process for purifying carbon nanotubes which has steps of 1) mixing carbon nanotubes which accompany carbon impurities with a reagent selected from a group consisting of oxidation agents, nitration agents and sulfonation agents in liquid phase, 2) reacting the carbon nanotubes with the reagent at a predetermined temperature in the liquid phase, wherein the carbon impurities except carbon nanotubes are selectively reacted to dissolve in the liquid phase, and 3) separating carbon nanotubes from which the impurities were released from the liquid phase then washing and drying it. A process for uncapping carbon nanotubes and a process for chemically modifying carbon nanotubes are also disclosed.Other References
|
| ||||||||||||||
