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Expired Canadian patentCanada

Process for the synthesis of fullerenes

CA 2091665 C · Owner: Pyrogenesis Inc. · Inventors: Grenier, Serge; Tsantrizos, Peter George

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Abstract From the Canadian patent

14-, A process is disclosed to synthesize fullerenes in a plasma reactor. It comprises introducing various amounts of carbon halides as the plasma forming gas in a plasma torch capable of producing a high enough temperature flame to dissociate the carbon bearing molecules into carbon and halogen atoms, hence forming a carbon cloud which condenses into a soot containing fullerenes. Also hydrocarbons and/or inert gases can be introduced in the torch as the plasma forming gas and reacted with carbon halides or halogens injected therewith or directly into the plasma flame at the exit of the torch. The process can use a high enthalpy nontransferred d.c. plasma torch or an induction plasma torch …

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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.

Why it's free to use

  • Filed March 15, 1993 and granted January 7, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 15, 2013.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 15, 2015.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 15, 1993
GrantedJanuary 7, 2003
Term endedMarch 15, 2013
Patent numberCA 2091665 C
Classification (IPC)C01B32/15 +1 more

Timeline

Timeline From CIPO dates

1994199619982000200220042006200820102012Application filedMarch 15, 1993Patent grantedJan 7, 2003Term endedMarch 15, 2013

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.