Heat treatment process for aluminum alloy sheet
CA 2197547 C · Owner: Marois, Pierre H. · Inventors: Bull, Michael Jackson; Gupta, Alok Kumar; Marois, Pierre H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process of producing solution heat treated aluminum alloy sheet material comprises subjecting hot- or cold-rolled aluminum alloy sheet to solution heat treatment followed by quenching and, before substantial age hardening has taken place, subjecting the alloy sheet material to one or more subsequent heat treatments involving heating the material to a peak temperature in the range of 100 to 300 ~C (preferably 130-270 ~C) holding the material at the , peak temperature for a period of time less than about 1 minute and cooling , the alloy from the peak temperature to a temperature of 85 ~C or less. The sheet material treated in this way can be used for automotive panels and has a good …
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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 September 5, 1995 and granted May 1, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 5, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 5, 2017.
- 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
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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.