Barrier film with improved extensibility for cheese packaging
CA 2040064 C · Owner: Cryovac, Inc. · Inventors: Lulham, Cedric Michael; Toney, Gloria G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A film which is useful in the packaging of newly formed blocks of cheese and demonstrates flexibility extensibility, and improved, sealing strength comprises an ethylene vinyl acetate/very low density polyethylene sealing layer. In addition to barrier properties flexibility, and extensibility are, preferably also provided by a core layer of, ethylene vinyl alcohol copolymer containing at least 32% by weight of ethylene. A preferred structure comprises a core layer of ethylene vinyl alcohol copolymer, two intermediate layers each comprising a polyamide; outer blend layers of very low density polyethylene ethylene, vinyl acetate, and anti-blocking agent and adhesive polymeric materials, to …
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 April 8, 1991 and granted June 13, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 8, 2013.
- 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.