Very tough polyolefin blends
CA 2205510 A1 · Owner: Hoechst Aktiengesellschaft · Inventors: Grellmann, Wolfgang; Bohse, Jurgen; Schurmann, Britta
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Very tough polyolefin blends, The blends according to the invention, of polyethylene and polypropylene havingimproved notched impact strength are distinguished by the fact that they containa) from 36 to 64% by weight of isotactic propylene homopolymer b) from 35 to 63% by weight of high density polyethylene (HDPE) and c) from 1 to 10% by weight of a random copolymer comprising from 75 to 85% by weight of ethylene units and from 15 to 25% by weight of propylene units, all stated percentages by weight being based on the total weight of the respective blend.
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 May 15, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 15, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 15, 2019.
- 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.