Cold work steel
CA 2448799 C · Owner: Sandberg, Odd · Inventors: Sandberg, Odd; Tidesten, Magnus; Joenson, Lennart
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cold work steel has the following chemical composition in weight-%: 1.25 - 1.75 % (C+N), however at least 0.5 % C 0.1 - 1.5 % Si 0.1 - 1.5 % Mn 4.0 - 5.5 % Cr 2.5 - 4.5 % (Mo+W/2), however max. 0.5 % W 3.0 - 4.5 % (V+Nb/2) however , max. 0.5 % Nb max 0.3 % S balance iron and unavoidable impurities and a , microstructure which in the hardened and tempered condition of the steel contains 6-13 vol-% of vanadium-rich MX-carbides -nitrides and/or , carbonitrides which are evenly distributed in the matrix of the steel where X , is carbon and/or nitrogen, at least 90 vol-% of said carbides nitrides and/or , carbonitrides having an equivalent diameter Deq, which is smaller than 3.0 , ~m; 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 May 17, 2002 and granted July 23, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 17, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2024.
- 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.