Multi-layer pipe
CA 2183693 C · Owner: Kohyama, Masaki · Inventors: Tokui, Shin; Kohyama, Masaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multi-layer pipe has an innermost layer formed of a butene polymer composition. At least one other layer is formed of a polyolefin resin composition comprising (A) 95- 5 parts by weight of a polyolefin resin (B) 5-95 parts by, weight of a filler, and (C) 0.1-10 parts by weight per 100 parts by weight of components (A) and (B) combined of a modified polyolefin resin. This multi-layer pipe undergoes minimal elongation by heat so that it is free from troubles by thermal deformation even when high temperature fluid is passed therethrough, has high rigidity and is thus, suitable as plumbing for cold and hot water.
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 August 20, 1996 and granted October 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 20, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2018.
- 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.