High strength hot-dip galvanized steel sheet and method for manufacturing the same
CA 2407384 C · Owner: Gamou, Akira · Inventors: Kitano, Fusato; Nagataki, Yasunobu; Gamou, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a high strength hot-dip galvanized steel sheet consisting essentially of 0.03 to 0.25% C 0.7% or , less Si, 1.4 to 3.5% Mn, 0.05% or less P 0.01% or less S, 0.05 , to 1% Cr, 0.005 to 0. 1% Nb by mass, and balance of Fe, and being made of a composite structure of ferrite and secondary phase and having an average grain size of the composite structure of 9M or smaller. Since the high strength hot-dip galvanized steel sheet of the present invention hardly induces softening at HAZ during welding, it is applicable to structural members of automobiles for "Tailor Welded Blanks" (TWB).
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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 February 26, 2002 and granted November 29, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 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.