Welded high-strength steel structure with excellent corrosion resistance
CA 2233338 C · Owner: Igarashi, Masaaki · Inventors: Ueda, Masakatsu; Igarashi, Masaaki; Kondo, Kunio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Welded high-strength steel structure with excellent SSC and corrosion resistance in a wet carbon dioxide environment having a low H2S concentration. A structure having a Vickers hardness of at most 860 and a joint tensile strength of at least 620MPa and composed of a base metal comprising a martensitic stainless steel with a martensitic or tempered martensitic structure containing 0.001 to 0.05%C and 9 to 14%Cr and a weld metal comprising an austenitic-ferritic stainless steel having a duplex structure composed of austenite and 35 to 75% by volume of ferrite and containing 22 to 27%Cr,7 to 11%Ni and 1.5 to 5%Mo, and at most 0.03%C as an impurity.
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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 September 27, 1996 and granted April 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 27, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 27, 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.