Raw material for phosphate fertilizer and method for manufacturing same
CA 2447411 A1 · Owner: Nkk Corporation · Inventors: Tanabe, Haruyoshi; Isoo, Tsuneo; Matsuno, Hidetoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A material for a phosphate fertilizer, which comprises a slag being formed in the dephosphorization of hot-iron and containing phosphoric acid and has a composition wherein the content of phosphoric acid satisfies the following formula (1), preferably formula (2): P2O5 >= 5.6 X F + 7 ..... (1) P2O5 >= 5.6 X F + 10 ..... (2) wherein P2O5 and F represent the contents of phosphoric acid and fluorine in the slag (mass %) respectively; and a method , for producing the material which comprises providing a hot-iron having a satisfactorily reduced Si concentration adding an oxygen source and a CaO , source to effect the dephosphorization of the hot-iron or comprises supplying , a CaO source …
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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 May 17, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 17, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 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.