Elastic membrane impermeable to gases and hydropneumatic accumulator equipped with this membrane
CA 2229692 A1 · Owner: Beal, Jean-Luc · Inventors: Le Roy, Christophe; Germain, Yves; Beal, Jean-Luc
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a gas impermeable elastic membrane comprising a film formed of a film of a gas impermeable copolymer comprising -OH groups, and two layers between which the film is incorporated. The two layers are made of a supple elastic copolymer material comprising polyamide blocks and polyether blocks possibly a rubber coating placed on at least one layer of supple and elastic material. Depending on the form preferred it is composed of an EVOH film between two layers of polyether block amide all covered on each side with X-NBR rubber. Application as a membrane for hydropneumatic accumulators. (Voir fig.I).
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 February 12, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 12, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 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.