Perfluoropolyethers and processes for preparing them
CA 2037543 A1 · Owner: Staccione, Anna M. · Inventors: Pasquale, Antonio; Staccione, Anna M.; Marraccini, Antonio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
3995, "NEW PERFLUOROPOLYETHERS AND PROCESSES FOR PREPARING THEM" Abstract, The invention relates to new peroxide perfluoropolyethers having formula:, (I), wherein: A and B are end groups, X represents a (R'0)mR" group where R' is selected from the class consisting of, -CF2- , -CF2-CF2- and and R" is a perfluoroalkyl group; the value of "m" ranging from 0 to 6. The invention relates also to processes for preparing said perfluoropolyethers and other classes of non peroxide perfluoropolyethers derived therefrom.
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 March 5, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 2013.
- 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.