Galvannealed steel sheet having improved spot-weldability
CA 2006756 C · Owner: Yamato, Koji · Inventors: Yasuda, Akira; Koumura, Hideo; Yasuda, Koichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A galvannealed steel sheet having a superior spot weldability characteristic in which the steel sheet has a base steel sheet cold-rolled from a material containing 0.005 wt% or less of C, 0.005 to 0.05 wt% of Ti, 0.01 to 0.1 wt% of Al 0.005, to 0.015 wt% of Nb and 0.0002 to 0.002 wt% of B and a hot-dip galvannealed layer containing 9 to 12 wt% of Fe. In the process for making the galvannealed steel sheet a cold-rolled sheet is, (1) annealed, (2) rapidly cooled (3) dipped in a hot melt of, plating zinc having an Al content of 0.13 wt% or more to form a plating layer and (4) alloying heat-treated.
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 December 28, 1989 and granted June 7, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 28, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 28, 2011.
- 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.