Multilayer plastic pipe
CA 2114506 A1 · Owner: Rober, Stefan · Inventors: Boer, Michael; Ries, Hans; Rober, Stefan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Multilayer Plastic pipe, A multilayer plastic pipe is disclosed. The pipe comprises an outer layer I made from a moulding composition based on a polyamide and a layer II adjacent to the outer layer. Layer II comprises a plasticiser-free polyvinylidene fluoride having a melt flow index of less than 14 g/10 min measured in accordance, with DIN 53 735 at 230°C and a load of 5 kg. The ratio of the thickness of layer II and the combined thickness of layer I and II 18 from 1-3 to 1:20. The multilayer pipe according to the invention has an extremely good resistance to and a good barrier action to diffusion by (petro)chemical substances solvents and, fuels, even at elevated temperatures. It is …
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.