Stretch film
CA 2493274 A1 · Owner: Ohlsson, Stefan Bertil · Inventors: Ohlsson, Stefan Bertil
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Stretch films are disclosed, the films having at least one layer formed of or including a polyethylene copolymer and having a natural draw ratio of at least 250%, a tensile stress at the natural draw ratio of at least 22 MPa and a , tensile stress at second yield of at least 12 MPa. In some embodiments the , polyethylene copolymer can have a CDBI of at least 70% a melt index 12.16 of , from 0.1 to 15 g/10 min. a density of from 0.910 to 0.940 g/cm3 a melt index , ratio 121.6/12.16 of from 30 to 80 and an Mw/Mn ratio of from 2.5 to 5.5. The stretch films are particularly useful in bundling and packaging applications.
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 August 22, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 22, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 22, 2025.
- 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.