Method of producing reduced iron agglomerates
CA 2266301 C · Owner: Fuji, Kojiro · Inventors: Sugiyama, Takeshi; Nishimura, Makoto; Umeki, Takao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Iron oxide agglomerates incorporated with the carbonaceous material having a particle size within a range of about 10 to 30 mm are prepared upon production of reduced iron agglomerates. Then the iron oxide agglomerates, incorporated with the carbonaceous material were laid thinly at a laying density of less than 1.4 kg/m2/mm or lower on a hearth of a moving hearth furnace. Subsequently, the iron oxide agglomerates are heated rapidly such that the surface temperature of the iron oxide agglomerates reaches 1200°C or, higher within one-thud of the retention period of time of the iron oxide agglomerates in the moving hearth furnace. Then the iron oxide, agglomerates are reduced till the …
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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 March 23, 1999 and granted February 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 23, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 23, 2021.
- 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.