Multi layer films
CA 2003075 C · Owner: Bainbridge, Anthony Warren Mcmurtrie · Inventors: Mcmurtrie, Anthony Warren; Stewart, Alan Gordon; Bainbridge, Anthony Warren Mcmurtrie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multi-layer heat shrinkable film not confined to but including at least three layers, one outside layer being of a blend of EVA and VLDPE, the other outside layer being VLDPE or a blend of VLDPE and EVA and an internal layer being EVA or primarily EVA. Such a multi-layer heat shrink film has good resistance of abuse. The film may include the optional barrier film and optionally two of the two contiguous co-extruded layers can be irradiated prior to the third or further layers. Such a precursor is then stretched into the film thickness required. The invention covers the method of treatment of such a film and a container or package including such a film.
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 November 16, 1989 and granted November 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 16, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 16, 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.