Block copolymer composition
CA 2019596 A1 · Owner: Nippon Zeon Co. Ltd. · Inventors: Ishii, Itsuo; Kawabuchi, Ichiro; Satoh, Akinobu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title of the Invention, BLOCK COPOLYMER COMPOSITION Abstract of the Disclosure, A block copolymer composition comprising (A) a tri-branched block copolymer (I) having a molecular weight of 150,000 to 450,000 represented by the general formula, (A - B)3X, wherein A represents a polymer block of an aromatic vinyl monomer, B represents a polymer block of a conjugated diene monomer, and X represents a residue of a tri-functional or tetra-functional alkoxysilane coupling agent and the weight ratio of the polymer block A to the polymer block B is f rom 10/90 to 30/70 (B) a di-branched block copolymer (II) having a molecular weight of 100,000 to 300,000 represented by the general formula, (C - …
Read the whole patent
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 June 22, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 2012.
- 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.