Instrumentation for co-extruding rubber mixtures
CA 2420772 A1 · Owner: Michelin Recherche Et Technique S.A. · Inventors: Marechal, Bernard; Calvar, Didier
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns an instrumentation for co-extruding rubber mixtures comprising a main extruder (1) including an extrusion head (10) comprising at least two channels (14 15) each circulating a rubber mixture (A B), said channels emerging onto an extrusion orifice (18) through which are delivered the two rubber mixtures (A B), the extrusion orifice (18) being delimited by first (111) and second (161) walls which also comprises at least a micro-extruder (2) of a third rubber mixture (C) whereof the extrusion head (22) is provided at its end with a nozzle (23) said nozzle passing through the two circulation channels (14 15) such that the third rubber mixture (C) is introduced in each …
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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 May 15, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 15, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 15, 2024.
- 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.