Joining of metallic pipe lined with thermoplastic polymer
CA 2081892 A1 · Owner: White, George · Inventors: White, George; King, David Campbell
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of joining two sections of metallic pipe (1) each of, which has a thermoplastic polymer lining (3) to form corrosion, resistant joints is disclosed. The method comprises inserting a sleeve (10) into each section of two pipes (1) that are to be joined so as to form a fluid tight seal between the liner (3) and the sleeve (10). The end of each section of pipe is then bevelled and , the two sections are welded together so as to form a corrosion resistant weld between each section of pipe and each sleeve and between each of the sleeves. The method is particularly useful in the lining of metallic pipe in the field e.g. in pipelines without, having to form flange joints.
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 May 1, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 1, 2013.
- 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.