Method for producing ultra clean steel
CA 2032020 C · Owner: Labate, Michael D. · Inventors: Labate, Michael D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process of treating molten steel to remove insoluble nonmetallic inclusions to produce clean and ultra clean steel comprising the steps of pouring molten steel into an insulated tundish having an insulated cover, maintaining a neutral atmosphere in said covered insulated tundish stirring the molten, steel with inert gas within said covered insulated tundish so as to precipitate said insoluble nonmetallic inclusions and move the same to the surface of the molten steel maintaining, and increasing molten steel temperature in said covered insulated tundish, directing the insoluble nonmetallic inclusions from the tundish, pouring clean and ultra clean steel from the covered insulated tundish.
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 12, 1990 and granted June 30, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 2012.
- 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.