Process for preparing an aluminum alloy sheet with improved bendability and aluminum alloy sheet produced therefrom
CA 2445667 A1 · Owner: Marois, Pierre H. · Inventors: Marois, Pierre H.; Gupta, Alok Kumar; Sorensen, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is described for producing an aluminum alloy sheet having excellent bendability for use in forming panels for automobiles. An aluminum alloy is used comprising 0.5 - 0.75% by weight Mg 0.7 - 0.85% by weight Si, 0.15 -, 0.35% by weight Mn 0.1 - 0.3% by weight Fe optionally 0.2 - 0.4% by weight Cu , and the remainder Al and incidental impurities and this alloy is cast into , ingots by semi-continous casting. The ingot is subjecting to hot rolling and cold rolling, followed by solution heat treatment of the formed sheet. This sheet material is then pre-aged by rapidly cooling from an initial pre-aging temperature of at least 80~C t room temperature at a cooling rate of more than …
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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 May 2, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 2, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 2, 2024.
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Timeline
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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.