Multilayer plastic pipe
CA 2114518 C · Owner: Feinauer, Roland · Inventors: Rober, Stefan; Feinauer, Roland; Herrmann, Hans-Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plastic pipe having improved resistance to chemicals and improved mechanical properties is disclosed. The pipe comprises at least three layers: an outer layer an, intermediate layer made of a moulding compound based on a mixture of a polyamide and a polyglutarimide and an inner layer made of a moulding compound based on a polyvinylidene fluoride. The outer layer is preferably made of a moulding compound based on a polyamide. The pipe has an outstanding resistance to and a good barrier action with respect to diffusion of (petro) chemicals, solvents and fuels. Since the adjacent layers are adhesively bonded to one another, no delamination occurs on thermal expansion or flexing of the pipe. …
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 January 28, 1994 and granted March 28, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 28, 2016.
- 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.