Improved wvtr film using wax in combination with a cavitated tie layer
CA 2294512 A1 · Owner: Heffelfinger, Michael Thomas · Inventors: Heffelfinger, Michael Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multilayer film having enhanced barrier properties with respect to oxygen and water vapor transmission is provided. The multilayer film includes a polyolefin core layer, a copolymer or terpolymer intermediate layer on at least one surface of the polyolefin core layer with the intermediate layer , having voids therein and including a wax trapped within the voids and a , surface layer on the intermediate layer. Multilayer films according to the present invention are particularly useful as packaging films for food products, and are successful in laminating printing or coating operations.
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 July 1, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 1, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 1, 2020.
- 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.