Easily tearable multilayer packaging film material
CA 2093170 A1 · Owner: Light, Susan L. · Inventors: Peterson, Gary D.; Light, Susan L.; Stachowski, Edmund B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A packaging material has a laminated structure 10 composed of a first layer 12 comprising oriented polypropylene, a second layer 14 comprising a polyether urethane adhesive material, a third layer 16 comprising aluminum foil or a flexible thermoplastic membrane resin material with a metallic membrane material, and a fourth layer 18 comprising a resin extrudate material. The oriented polypropylene provides linear tear characteristics that enables the package 22,24 to tear continuously along a defined line. The second layer 14 provides an adhesive lamination between the first 12 and third layer 16. An aluminum foil layer provides moisture and light barrier protection. In the fourth layer 18, …
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 1, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 1, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 1, 2015.
- 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.