Steel for steel pipe
CA 2574025 C · Owner: Sumitomo Metal Industries, Ltd. · Inventors: Higuchi, Yoshihiko; Numata, Mitsuhiro; Omura, Tomohiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A steel for steel pipes which comprises on the percent by , mass basis, C: 0.2 to 0.7% Si: 0.01 to 0.8%, Mn: 0.1 to 1.5%, S: 0.005% or less P: 0.03% or less, Al: 0.0005 to 0.1%, Ti: 0.005 to 0.05%, Ca: 0.0004 to 0.005%, N: 0.007% or less Cr: , 0.1 to 1.5%, Mo: 0.2 to 1.0%, Nb: 0 to 0.1% Zr: 0 to 0.1%, V: , 0 to 0.5% and B: 0 to 0.005% with the balance being Fe and , impurities in which non-metallic inclusions containing Ca Al, Ti, N, O, and S are present, and in the said inclusions (Ca%)/(Al%) is 0.55 to 1.72, and (Ca%)/(Ti%) is 0.7 to 19 can be used as a raw material for oil country tubular goods being , used at a greater depth and in severer corrosive circumstances such as casings and …
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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 July 19, 2005 and granted April 23, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 19, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.