Method of manufacturing a surface layer modified, molded article of aromatic polymer and the article so produced
CA 2023295 C · Owner: Kutowy, Oleh · Inventors: Kutowy, Oleh; Tremblay Andre Y.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Molded articles of aromatic polymer (e.g. polysulfone) are produced by treating the polymer to, produce a molded article (e.g. porous membrane or hollow fiber) therefrom having at least a, pardon of the surface layer containing units of the formula: (see formula I), where, n is zero or one at least one of R and R1 is present, m is the degree of polymerization and, when n is zero, R is H and R1 is a labile group which is exchangable with an alkali, metal, and, when n is one, X n is selected from the group consisting of SO2 O, lower alkyl groups and, aromatic groups and, i) when X n is selected from the group consisting of O lower alkyl groups and, aromatic groups R is H and R1 is a labile …
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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 August 15, 1990 and granted January 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 15, 2012.
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