Dissimilar arm asymmetric radial or star block copolymers for adhesives and sealants
CA 2135266 A1 · Owner: Himes, Glenn R. · Inventors: Chin, Steven S.; Hoxmeier, Ronald J.; Spence, Bridget A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Radial or star asymmetric block copolymer of the following formulae, (I) (A-HD)x-Y-(UD)z or (II) (UD-A-HD)X-Y or (III) ((UD)y-A-HD)x-Y-(UD)z or (IV) (A-HD)1)X-Y-(HD2)2 or (V) (HD2-A-HD1)X-Y or (VI) ((HD2)2)y A-HD1)X-Y(HD2)2 wherein A is a vinyl aromatic hydrocarbon block having a molecular weight of from 4000 to 20,000, HD is a hydrogenated conjugated diene block having a molecular weight of from 10,000 to 100,000 Y, is a multifunctional coupling agent UD is an unhydrogenated, conjugated diene block having a molecular weight of from 1000 to 80,000, x is an integer from 2 to 20, y is 0 or 1 z is an integer, from 1 to 10, and x + z ranges from 3 to 30; functionalized derivatives thereof and …
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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 November 7, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 7, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 7, 2016.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.