Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Reexamination Certificate
2005-03-22
2005-03-22
Hendrickson, Stuart L. (Department: 1754)
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
C423S447100
Reexamination Certificate
active
06869583
ABSTRACT:
Carbon structures, e.g. carbon nano-fibers, suitable for absorbing hydrogen at low pressures and low temperatures are produced by a selective oxidation and/or acid reflux process. The process includes heating an impure mixture containing a crystalline form of carbon in the presence of an oxidizing gas at a temperature and time sufficient to selectively oxidize and remove a substantial amount of any amorphous carbon impurities from the mixture. Metal containing impurities can be removed from the mixture by exposing the desired carbon and accompanying impurities to an acid to produce a carbon fiber that is substantially free of both non-fiber carbon impurities and metal impurities. Another aspect of the present invention includes purified carbon structures that can store hydrogen at low pressures and temperatures.
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Eklund Peter C.
Fujiwara Yoshiya
Goto Hajime
Harutyunyan Avetik
Pradhan Bhabendra
Hendrickson Stuart L.
Honda Giken Kogyo Kabushiki Kaisha
Lish Peter J
McDermott Will & Emery LLP
The Penn State Research Foundation
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