Packaging adhesive having low oxygen barrier properties
CA 2225029 C · Owner: Deitch, Jeffrey H. · Inventors: Kenion, Grant B.; Deitch, Jeffrey H.; Chen, Mai
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A two-part, water-free, solvent-free, liquid laminating adhesive is provided which joins two sheets of polymeric material, which adhesive, in cured form provides substantially no contribution to the oxygen barrier properties of the laminate. The first part is a mixture of a polyol A), preferably a polyether and a, polymer B) formed from polymerization of .alpha..beta.-ethylenically unsaturated monomers polymer B), preferably being formed in situ from monomers dissolved in polyol A). The second part is a multi-functional isocyanate, preferably an isocyanate-terminated urethane formed by reacting a poly-isocyanate monomer with a polyol.
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 17, 1997 and granted February 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2019.
- 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.