Steel pipe and a method for welding thereof and pipeline resistant to carbon dioxide corrosion
CA 2014471 C · Owner: Uegaki, Tatsufumi · Inventors: Kimura, Mitsuo; Uegaki, Tatsufumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pipeline and steel pipe having superior resistance to carbon dioxide corrosion and suitable for transporting crude oil, natural gas and the like containing carbon dioxide. The pipeline includes in combination pipe, sections including a base metal having a composition containing not more than 0.25 wt% of C from 0.01 to 0.50, wt% of Si; from 0.1 to 2.0 wt% of Mn; not more than 0.03 wt% of P; not more than 0.01 wt% of S; from 0.25 to 1.0 wt% of Cr; from 0.01 to 0.10 wt% of A? and the balance, substantially Fe and inevitable impurities and a weld, metal connecting the pipe sections together having a Cr content ranging between a value which is 0.2 wt% smaller than the Cr content of the base …
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 April 12, 1990 and granted June 28, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 2012.
- 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.