Hollow fiber membrane for dialysis
CA 1237260 A · Owner: Toyo Boseki Kabushiki Kaisha · Inventors: Kanaizumi, Masaru; Ohno, Makoto; Miyagi, Morio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract:, The invention provides a hollow fiber membrane suitable for dialysis made of a cellulose ester. The hollow fiber membrane has a membrane thickness of less than 20µ and a, yield strength Sb (g/filament) after being heat-treated at 80°C for 20 hours which satisfies the following formula (I): 0.90 < Sb/Sa < 1.10 (I), wherein Sa is the yield strength (g/filament) of the hollow fiber membrane measured before the heat treatment. The present invention further provides a method for producing the hollow fiber membrane which comprises extruding a spinning solution of a cellulose ester through circular slits around an inner tube of a spinneret while simultaneously extruding a core solution …
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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 31, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 2005.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.