Process for the preparation of fullerenes and heterofullerenes
CA 2082775 C · Owner: Degussa Aktiengesellschaft · Inventors: Peters, Gregor; Jansen, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is described a process for the preparation of fullerenes and heterofullerenes - in the latter the carbon is partly replaced by boron and nitrogen - which comprises vaporizing shaped carbon pieces or shaped carbon pieces in contact with shaped boron nitride pieces in an inert gas atmosphere under reduced pressure in an inductive heating zone and depositing the vaporized portions on a cold surface as fullerene-containing soot and isolating fullerene or heterofullerene in a purification step from the soot using a solvent.
Read the whole patent
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 November 12, 1992 and granted February 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.