Preparation of perfluoropolyethers having at least one -ch2oh or -ch(cf3) oh end group
CA 2467152 C · Owner: Solvay Solexis S.P.A. · Inventors: Picozzi, Rosaldo; Tonelli, Claudio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing perfluoropolyethers having at least one -CH2OH or -CH(CF3)OH end group by reaction of the corresponding pefluoropolyethers having at least one carboxylic -COOH or ketonic -(CF3)C=O end group with gaseous hydrogen between 80°C and 140°C, in the presence of hydrogenation catalysts.
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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 May 11, 2004 and granted April 2, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 11, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 11, 2026.
- 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
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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.