Multi-layer plastic closure with barrier properties
CA 2314592 A1 · Owner: Riffer, David B. · Inventors: Riffer, David B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plastic closure that comprises a closure body having a base wall with a peripheral skirt with threads on the skirt for securing the closure to a container. A liner may be, secured to the interior of the closure body preferably by being compression , molded in situ on the base wall. The closure base wall consists essentially of a multiplicity of layers of a matrix polymer, material such as PP alternating with a multiplicity of layers of a barrier material such as EVOH, to resist transmission of gas water vapor and/or flavorants through the closure. Layers of a, compatibilizer material such as a maleic anhydride grafted polymer preferably are disposed, between the matrix and barrier …
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 July 27, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 27, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 27, 2022.
- 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.