Duplex stainless steel
CA 2397592 C · Owner: Sandvik Ab · Inventors: Klockars, Mattias; Kangas, Pasi; Chai, Guocai
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a duplex stainless steel alloy with austeniteferrite structure, which in hot extruded and annealed finish shows high , strength, good corrosion resistance and good weldability which is , characterized in that the alloy contains in weight-% max 0.05 % C 0-2.0 % Si, 0-3.0 % Mn, 25-35 % Cr, 4-10 % Ni 2-6 % Mo, 0.3-0.6 % N, as well as Fe and normally occurring impurities and additions whereby the content of ferrite is , 30-70 %.
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 March 1, 2001 and granted January 28, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 1, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 1, 2023.
- 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.