Rubber composition for inner liner
CA 2364678 C · Owner: Sumner, Anthony · Inventors: Langstein, Gerhard; Verhelst, Marc; Bohnenpoll, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The object of the present invention is to provide a rubber composition for a tire inner liner and more particularly, to a rubber composition for an inner liner of a tubeless tire characterized in that said rubber composition comprises a low-gel high molecular weight isoolefin multiolefin copolymer in particular a low-gel, high molecular weight butyl rubber or a low-gel, high molecular weight isoolefin multiolefin copolymer synthesized from isobutene isoprene and optionally further monomers with a multiolefin content of greater than 2.5 mol% a molecular weight M w of greater than 240 kg/mol and a gel content of less than 1.2 wt.% and/or a halogenated low-gel, high molecular weight isoolefin …
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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 December 7, 2001 and granted January 24, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 7, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 2023.
- 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.