Oxygen permeable multilayer film, process for making same, packaging process using same, and packaged product comprising same
CA 2127409 C · Owner: Kuo, Betsy P. · Inventors: Kuo, Betsy P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multilayer film comprises: a first layer comprising a first homogeneous ethylene/.alpha.-olefin copolymer; a second layer comprising a polyolefin; and a third layer comprising a second homogeneous ethylene/.alpha.-olefin copolymer. The second layer is between the first layer and the third layer the second layer is chemically different from the first layer and the third layer and the multilayer film has an oxygen transmission rate of from about 500 to 50,000 cc/m2/ 24hr STP. Also disclosed are a process for making the film a packaging process using the film, and a product packaged in the film. The film is especially suitable for the packaging of oxygen- sensitive products such as lettuce, …
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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 July 5, 1994 and granted December 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 5, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.