Block copolymers
CA 1054741 A · Owner: Societa' Italiana Resine S.I.R. S.P.A. · Inventors: Bianchi, Gaudenzio; Colombo, Paolo; Radici, Pierino
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Block copolymer of the structure A-B wherein: - A is a polylactone block of recurring units: wherein PM is a linear polymethylene chain having from 2 to 13 carbon atoms, - B is a polyoxymethylene block of recurring units . The block copolymer contains at least 2 wt.% of block B and at least 0.1 wt.% of block A. The block copolymer can be used as modified polyacetal when rich in block B, or as special additive for plastics materials when rich in block A.
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
- Granted May 15, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 15, 1996.
- 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.