Process for producing a cold rolled steel sheet having a good ageing resistance by continuous annealing
CA 1321125 C · Owner: Yamada, Teruaki · Inventors: Kawai, Kenji; Ukena, Toshiyasu; Akisue, Osamu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cold rolled steel sheet having a good ageing resistance is produced by subjecting a cold rolled steel sheet to continuous annealing including recrystallization, grain growth, quenching, supercooling reheat-, ing and overageing according to inclinatory cooling where after the recrystallization and the grain growth the steel sheet is quenched at a cooling rate of 50 to 250°C/sec from 720 - 600°C to 200 - 310°C; after retaining the steel sheet at the same temperature for 0 to 15 seconds, the steel sheet is reheated by at least 40°C up to 320 - 400°C; then the steel sheet is cooled from or retained at the same temperature at a rate of not more than 0.7°C/sec including the time for retaining …
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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
- Granted August 10, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 10, 2010.
- 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.