Joining lined pipe items
CA 2213248 C · Owner: Bg Plc · Inventors: Hill, Tom; Cummings, Robert James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Steel pipe items such as pipes (10) are each joined by a girth weld (14) to tubular steel fittings (12) and the pipes (10) are each lined by pulling a polyethylene liner (30) through a die and through the pipe (10) and through the fitting (12). A stainless steel ring (32) is forced into each fitting (12) to compress the liner (30) and force it into grooves (20) in the internal surface of the fitting (12). The grooves (20) are separated by castellations (22). The grooves (20) are machined in a corrosion-resistant cladding (18) deposited on the interior of each fitting (12). Alternatively the whole of , each fitting (12) is made of corrosion-resistant Duplex steel. The ends of the …
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 February 22, 1996 and granted August 28, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 22, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 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.