Vacuum refining method for molten steel
CA 2201364 C · Owner: Yonezawa, Kimitoshi · Inventors: Yonezawa, Kimitoshi; Miyamoto, Kenichiro; Sasakawa, Shinji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a molten steel refining method for refining molten steel the carbon, content of which is not more than 0.1 weight % by blowing, oxygen gas for decarburization at a blowing speed so that a cavity, the depth of which is 150 to 400 mm can be, formed on the surface of molten steel in a straight barrel type vacuum refining apparatus in which a straight barrel type vacuum vessel having no vessel bottom and a ladle are arranged. When necessary, the above decarburizing processing conducted by blowing oxygen gas is combined with: an A1 heating process in which A1 added into the vacuum vessel is burned by oxygen gas blown into the vacuum vessel at a blowing speed such …
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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 1, 1996 and granted April 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 1, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 1, 2018.
- 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.