Plastic tube with improved acoustic properties, and process for manufacturing such a tube
CA 2222357 A1 · Owner: Hugues, Francois · Inventors: Hugues, Francois; Tremillon, Jean-Michel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Plastic tube produced by extrusion or injection containing a filler material to improve its acoustic insulation properties. The tube comprises at least two adjoining coaxial layers (1 2) along a common surface; the first external layer (1) consisting of conventional plastic and the second layer (2) of plastic containing filler material (C) to improve its acoustic insulation properties.
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 December 9, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 9, 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.