Coextrusion binder, its use for a multilayer structure and the structure thus obtained
CA 2209322 C · Owner: Elf Atochem S.A. · Inventors: Jacquemet, Regis; Le Roy, Christophe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a coextrusion binder obtained through grafting with an unsaturated carboxylic acid anhydride or its derivatives of a mixture of an ethylene copolymer and an EPR-type elastomer. The grafted mixture is eventually diluted in another ethylene copolymer. The binder is useful for making polyolefin/binder/polyamide structures or EVOH. These structures are useful for making rigid hollow bodies.
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 June 26, 1997 and granted August 20, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 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.