Soluble polyarylene ether sulfones
CA 2037882 A1 · Owner: Stockinger, Friedrich · Inventors: Stockinger, Friedrich; Kramer, Andreas; Hoffmann, Kurt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Soluble polyarylene ether sulfones, Abstract of the Disclosure Polyarylene ether sulfones which have a reduced viscosity of 0.1 to 2.0 dl/g measured at, 25°C in a 1 % solution in N-methylpyrrolidone (NMP) and which contain, based on the, total number of structural units present in the polyarylene ether sulfone resin 99-1 mol %, of a recurring structural unit of formula I (I), and 1-99 mol % of a recurring structural unit of formula 1:1 (II), wherein the aromatic rings in the structural unit of formula I are unsubstituted or substituted by one or more C1-C4alkyl groups C1-C4alkoxy groups or halogen atoms, Ar1 is a radical of formula IIIa-IIIc (IIIa), wherein a is 0 or 1, (IIIb), or (IIIc)
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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 March 8, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 8, 2013.
- 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.