Semipermeable membranes of copolyamides
CA 1101161 A · Owner: Bayer Aktiengesellschaft · Inventors: Wolf,Gerhard D.; Elfert, Klaus; Kunzel, Hans E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Semipermeable membranes of copolyamides Abstract of the Disclosure, The invention relates to semipermeable membranes with a water absorption capacity of from 4.5 to 10 % by weight preferably from 4.5 to 8% by weight as measured on approximately 40 µ thick symmetrical films at room temperature and 65 % relative air humidity with a, throughflow of at least 80 1/m2d for a desalination level of at least 85 % and consisting of a fully aromatic copolyamide with a relative viscosity of z1,4 as, measured on a 0.5 % N-methyl pyrrolidone solution at a temperature of 20°C. Le A 16 828-Ca
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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
- Granted May 19, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 19, 1998.
- 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.