High-strength steel sheet for forming and production thereof
CA 2082807 A1 · Owner: Kato, Toshiyuki · Inventors: Togashi, Fusao; Masui, Susumu; Kato, Toshiyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides a high-strength steel sheet having a small plane anisotropy, a low yield ratio, a complete non-aging property and a high r-value and hardly causing the softening in high temperature heating which is obtained by heating a slab of steel having a composition by weight of C: 0.01-0.1% Si:, 0.1-1.2%, Mn: not more than 3.0%, Ti: value of (Ti%-1.5S%-3.43N%)/C% of 4-12, B: 0.0005-0.005% Al: not, more than 0.1%, P: not more than 0.1% S: not more than, 0.02% and N: not more than 0.05% at a temperature of 1100-1280°C and hot rolling and if necessary cold rolling - annealing.
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 13, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 13, 2014.
- 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.