Oriented white opaque multilayer heat sealable film and method of forming same
CA 2004705 C · Owner: Liu, Leland Li-Jen · Inventors: Liu, Leland Li-Jen; Cyr, Patricia A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multi-layer heat sealable structure comprising a substrate including an opaque polyolefin film. A second layer is extruded an at least one surface of the substrate. The second layer includes a heat sealable homopolymer, copolymer terpolymer or blend, thereof. A primer coating is disposed on at least one surface of the second layer. A heat sealable layer is disposed on the primer coating. The heat sealable layer includes a vinylidene chloride copolymer containing at least 50% by weight of vinylidene chloride. A method for producing the present multi-layer heat sealable structure is also disclosed.
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 December 6, 1989 and granted August 31, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 6, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 6, 2011.
- 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.