Synthesis of derivatized fullerenes with superacid catalysts
CA 2082593 A1 · Owner: Exxon Research And Engineering Company · Inventors: Hsu, Chang S.; Miller, Glen P.; Millar, John M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to novel compositions of matter certain derivatized fullerenes, and the process of making them. The derivatized fullerenes of the present invention contain substituent groups in even numbers and are produced by contacting the fullerenes with an oxidizing agent, such as a strong acid or superacid then, adding a suitable nucleophilic quenching agent such as an alcohol thiol or aromatic that contains the substituent group to be added. Terminal 1,y-difulleroxyalkanes result from trapping with terminal 1,y-diols where y is the number of carbon atoms in the diol. Odd numbered derivatized fullerenes are produced by heating the even number derivatized fullerenes thus …
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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 November 10, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2014.
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Timeline
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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.