Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Reexamination Certificate
2005-04-26
2005-04-26
Silverman, Stanley S. (Department: 1754)
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
C423S447300, C204S164000, C204S173000, C977S726000
Reexamination Certificate
active
06884405
ABSTRACT:
A fullerene
anotubes mixture is produced during a periodical pulsed auto-regulated action of the electric current arc-discharge in the multi-component hydrocarbon medium with limited fullerenes' solubility, besides, the action is continued until the medium dissolves C60. Higher fullerenes absorbed by the ultra-thin graphite particles are separated from C60dissolved in the liquid medium by sedimentation, whereas the carbon nanotubes are separated from the ultra-thin graphite particles by treating with a boiling concentrated HN03 acid and by low speed centrifuging/acid mixture until the black sediment of the ultra-thin graphite particles is precipitated to the bottom. The periodically pulsed auto-regulated regime of the electric-current arc-discharge is performed by contact breaking an electric circuit due to lifting spherical contactors by gaseous products released during the action and by switching the circuit due to the contacts' going down under action of gravity.
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Blackwell Sanders Peper Martin LLP
Lish Peter J
Rosseter Holdings Limited
Silverman Stanley S.
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