Polypropylene base porous film and production process for the same
CA 2329606 A1 · Owner: Osaki, Daisuke · Inventors: Osaki, Daisuke; Takahashi, Yoshinori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Provided is a porous film which is excellent in a water vapor transmission rate, a tear strength and a weatherability. This porous film can be produced by melt-extruding for example, by a, T-die method, a composition comprising 100 parts by weight of a resin blend (1) comprising 100 parts by weight of 1 an ethylene-propylene copolymer, 3 to 40 parts by weight of 2 a low density polyethylene and 3 to 40 parts by weight of 3 an ethylene-vinyl acetate copolymer and 100 to 200 parts by weight of calcium carbonate (2) or, a composition comprising 100 parts by weight of the above resin blend (1), 100 to 200 parts by weight of calcium carbonate (2) 0.5 to, 20 parts by weight of titanium dioxide …
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 December 27, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 27, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 27, 2022.
- 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.