Composite polyester films with barrier properties
CA 2295857 C · Owner: Toray Plastics Europe S.A. · Inventors: Veyrat, Didier; Maitre, Eric
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns composite polyester films with good barrier properties relative to gases. More precisely, it concerns a biaxially drawn film based , on polyester and having improved barrier properties relative to gases characterised in that it comprises a base polyester film of 5 to 50 µm coated on one of its two surfaces with a deposit containing polyvinyl alcohol and a water dispersible copolyester with sulphonyloxy units said composite , film having permeability to oxygen measured at 23 ~C under 50 % relative humidity, not more than 5 cm3/m2/24h. Said composite films have besides being , transparent and having barrier properties excellent resistance to mechanical , stresses …
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 14, 1998 and granted December 9, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 14, 2020.
- 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.