Pre-reduced iron oxide
CA 2006253 C · Owner: Cra Services Limited · Inventors: La Nauze, Robert David; Dry, Rodney James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is directed to process and apparatus for supplying pre-reduced iron oxides to a smelting vessel by directing a hot reducing offgas form the vessel into a vertical riser duct without substantial cooling of the offgas and entraining particulate iron oxide containing material in the hot reducing offgas as the gas is conveyed upwardly through the duct. The hot gas heats the entrained material to a temperature at which partial reduction of the iron oxide occurs, the hot gas thereby losing sensible heat. Additional materials may be introduced to the duct for entrainment in the gas. Particulate material is separated from the gas and the partially reduced material is introduced to the …
Read the whole patent
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 December 20, 1989 and granted August 11, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2011.
- 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.