Cold reduced non-aging deep drawing steel and method for producing
CA 2050566 C · Owner: Hook, Rollin E. · Inventors: Hook, Rollin E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cold reduced, non-aging, aluminum killed steel characterized by an elongated grain structure and having an r m value at least 1.8 produced from a slab having a reduced hot rolling temperature. A slab consisting essentially of ~, 0.08% carbon, ~ 0.1 % acid sol. aluminum ~ 0.2% manganese, all percentages, by weight the balance iron and unavoidable impurities is hot rolled to a , sheet, from a temperature less than 1260°C. Preferably the slab is , continuously cast, from a melt consisting essentially of 0.03-0.08% acid sol. aluminum 0.003-, 0.007% total nitrogen, ~ 0.20% manganese wherein % acid sol. aluminum x %, total nitrogen is within the range of 1 x 10-4 to 5 x 10-4 and is hot rolled …
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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 3, 1991 and granted January 23, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 3, 2013.
- 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.