Process for the preparation of peroxidic perfluoropolyethers
CA 2045679 C · Owner: Sianesi, Dario · Inventors: Marchionni, Giuseppe; Sianesi, Dario; Marraccini, Antonio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is disclosed for preparing peroxidic perfluoropolyethers comprising perfluoroalkylenoxy units having at least two carbon atoms, characterized in that one or more perfluoroolefins, except tetrafluoroethylene used alone, are reacted with oxygen in the liquid phase at a temperature not exceeding 50°C and in the presence of one or more compounds having one or more F-X bonds in which X, is selected from the group consisting of F O and Cl.
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 April 20, 1990 and granted August 22, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2012.
- 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.