Essentially linear polymers
CA 2041885 A1 · Owner: Kainmuller, Thomas · Inventors: Kainmuller, Thomas; Stockinger, Friedrich; Pfaendner, Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
K-18064/A/CGM367, Essentially linear polymers Abstract of the disclosure, Essentially linear polymers having a reduced viscosity of from 0.1 to 2.0 dl/g measured, on a 1 % by weight solution in N-methylpyrrolidone (NMP) at 25°C and containing at, least a proportion of structural units of the formula I (I), in which the aromatic rings are unsubstituted or substituted Ar is a divalent aliphatic, cycloaliphatic araliphatic or aromatic radical having up to 50 carbon atoms X1 is a direct, bond, -SO2-, -CO-, -CO-O- -CO-NH- or , in which R2 is a hydrogen atom or methyl and Q1 is -O-, -NH-, -S- or -OCO- Y1 is a direct bond, -SO2-, -CO-, -O-CO- -NH-CO- or , in which R2 is a hydrogen atom or methyl …
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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 May 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 6, 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.