Separation membrane, separation membrane element, separation membrane module, sewage treatment apparatus, and method for making the separation membrane
CA 2432046 C · Owner: Furuno, Shuji · Inventors: Morikawa, Hirofumi; Furuno, Shuji; Henmi, Masahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A separation membrane having a porous substrate and a porous resin layer on at least one surface of the porous substrate and the porous resin layer contains a resin. Part of the resin permeates through the porous substrate to form a composite layer. At least one of the following relationships (1) and (2) is satisfied: (1) the porous resin layer has an average pore size in the range of 0.01 to 0.2 µm and a standard variation of the pore size of 0.1 µm or less at the surface, and (2) the porous resin layer has macrovoids having short diameters of 0.05xA or more wherein A represents the thickness of the porous substrate, and the rejection of microparticles having an average …
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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 5, 2002 and granted April 5, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 5, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 5, 2024.
- 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.