Multi-layer oriented polypropylene films with modified core layer
CA 2393148 A1 · Owner: Migliorini, Robert A. · Inventors: Migliorini, Robert A.; Liestman, David A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multilayer, oriented, polymeric film and the method for its manufacture are provided by the present invention. The film comprises a first and second skin layer, and a core layer comprising polypropylene a polymeric modifier, e.g. isotactic polypropylene and a hydrocarbon resin, e.g. a saturated alicyclic resin. The method for manufacturing the film of the present invention comprises steps of coextruding a first skin layer comprising a polymer a core , layer comprising polypropylene a polymeric modifier, e.g. isotactic , polypropylene and a hydrocarbon resin, e.g. a saturated alicyclic resin and , a second skin layer comprising a polymer; stretching the film in the machine direction, …
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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 22, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 22, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 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
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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.