Polymer compositions and their blends
CA 2066918 A1 · Owner: Tollefson, Norris M. · Inventors: Williams, Joel L.; Tollefson, Norris M.; Grippi, Nicholas A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is polymer compositions and their blends. The polymer blends comprise polyethylene naphthalate, an oxidizable resin and an oxidation catalyst. The polymer compositions and their blends are useful for providing an effective barrier against gas permeability in containers and for extending shelf-life of containers, especially evacuated blood collection devices.
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 23, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2014.
- 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.