Methods of forming poly(ethylene chlorotrifluoroethylene) membranes
CA 2733826 C · Owner: Siemens Water Technologies Holding Corp. · Inventors: Muller, Heinz-Joachim; Mullette, Daniel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods of forming membranes and porous polymeric material by heating a mixture , to a temperature greater than 200°C to form a solution consisting essentially of , poly(ethylene chlorotrifluoroethylene) and at least one solvent selected from the group , consisting of a compound according to formula I or formula II: (see formula I), (see formula II), wherein R1 R2, and R3 are alkyl; R4 is selected from the group consisting of H, OH, OR5, OCOR5, an alkyl, and an alkoxy; and R5 is an alkyl.
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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 February 12, 2003 and granted July 22, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 12, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 2025.
- 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.