Charge mosaic membrane and production process thereof
CA 2092837 C · Owner: Takizawa, Minoru · Inventors: Takizawa, Minoru; Fukutomi, Takashi; Nakamura, Michiei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A charge mosaic membrane is made of a cationic polymer and an anionic polymer. At least one of the cationic and anionic polymers is in the form of spheres havinq a diameter of 0.01-10 µm. The charge mosaic membrane has been improved inter alia in the ability to selectively separate an electrolyte or non electrolyte and also in mechanical strength, so that it is useful for the separation of an electrolyte or non-electrolyte or for desalination. A process for the production of the charge mosaic membrane is also described. The production process can provide the charge mosaic membrane at low cost.
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 29, 1993 and granted June 16, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 29, 2015.
- 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.