Multilayer plastic pipe
CA 2114503 A1 · Owner: Jadamus, Hans · Inventors: Boer, Michael; Ries, Hans; 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 an outer layer made of a moulding compound based on a polyamide and an inner layer made of a moulding compound based on polyvinylidene fluoride, as well as three intermediate layers. The intermediate layer adjacent to the outer layer is made of a moulding compound based on a mixture of from 95 -to 99% by weight of a linear crystalline polyester and from 1 to 5% by weight of a compound having at least two isocyanate groups present in the mixture in a concentration of from 0.03 to 0.3% by weight. The intermediate layer adjacent to the inner layer is made of a moulding …
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. No grant is recorded for it in Canada; had it been granted, its 20-year term would have 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.