Process for improving the cold formability of heat-treatable steels
CA 2026307 A1 · Owner: Hollenberg, Lutz · Inventors: Hollenberg, Lutz; Lang, Cestmir; Muschenborn, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
29.08.1990, - 1 - WE/Su 89/308 Z2, Abstract The invention relates to a process for improving the cold formability of hot rolled or cold rolled heat-treatable steels. The characterizing feature of the invention is that with a composition of (in % by weight), 0.32 - 0.54 % C 0.05 - 0.40 % Mn, 0.41 - 1.5 % Si, 0.02 - 0.15 % Al maximum 0.05 % Cr, maximum 0.05 % S, maximum 0.03 % P maximum 0.02 % N, residue iron and unavoidable impurities, prior to the final cold forming and quench hardening with subsequent tempering is performed for at least 15 hours at temperatures between 620 and 680 C to substantially complete graphitization, while with a composition of 0.55 - 1.3 % C, 0.20 - 0.30 % Mn, 0.41 …
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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 26, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 26, 2012.
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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.