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Expired Canadian patentCanada

Method for controlling uniformity of alloy content in continuously cast steel

CA 1288929 C · Owner: Frank, Larry A. · Inventors: Rellis, Daniel, Jr.; Knoepke, John R.; Pielet, Howard M.

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Abstract From the Canadian patent

METHOD FOR CONTROLLING UNIFORMITY OF ALLOY CONTENT IN CONTINUOUSLY CAST STEEL", An alloying ingredient is added to molten steel entering the tundish in a continuous casting process. The concentration of the alloying ingredient is maintained substantially uniform throughout the cast by exercising certain controls. Small scale short term, variations in the mass flow rates of the alloying ingredient and molten steel and in the recovery of the alloying ingredient are attenuated by employing a system having certain characteristics.

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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

  • Granted September 17, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 17, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 5, 1986
GrantedSeptember 17, 1991
Term endedSeptember 17, 2008
Patent numberCA 1288929 C
Classification (IPC)B22D11/10 +1 more

Timeline

Timeline From CIPO dates

19871990199319961999200220052008Application filedSep 5, 1986Patent grantedSep 17, 1991Term endedSep 17, 2008

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.