Method for reducing a particulate material containing a metal, especially iron ore
CA 2465990 C · Owner: Schenk, Johannes · Inventors: Ofner, Hanspeter; Kepplinger, Leopold Werner; Schenk, Johannes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a process for reducing iron-ore-containing particulate material in at least a two-stage , process, reducing gas is conducted through at least two reaction zones consecutively , arranged in series and formed by a moving particulate material and the particulate material , passes through the reaction zones in reverse order to the reducing gas with , the particulate , material being heated in the reaction zone arranged first for the particulate material and , being reduced in the further reaction zone. In order to achieve a maximum preheating temperature without any formation of magnetite, the reducing gas added to the first reaction zone is conditioned such that no or hardly any , …
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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 August 28, 2002 and granted February 7, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 2024.
- 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.