High tensile strength hot-dipped steel sheet and method or producing the same
CA 2390808 C · Owner: Mochizuki, Kazuo · Inventors: Mochizuki, Kazuo; Kyono, Kazuaki; Kato, Chiaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
As to a steel composition, in this invention Si content is regulated to , a given range and Nb and Cu or Ni Mo are compositively added, and a , recrystallization annealing is carried out to form an internal oxide layer just , beneath a surface of a steel sheet and a surface oxide simultaneously formed on , the surface of the steel sheet is removed by pickling. As a result the , formation , of oxides of Si, Mn and the like is considerably decreased on the surface of the , steel sheet in a subsequent heating before plating because the above internal oxide layer acts as a diffusion barrier. Thus according to the invention, there can be obtained high tensile strength hot-dipped steel …
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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 10, 2001 and granted November 8, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 10, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 10, 2023.
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Timeline
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.