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Expired Canadian patentCanada

Mill arrangement and a process of operating the same

CA 1333335 C · Owner: Schiffer, Wilhelm · Inventors: Eichberger, Ernst; Rockenschaub, Walter; Puhringer, Othmar

CIPO record

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

Disclosed is a steel-producing mill comprising instead of a usual blast furnace, a direct reduction plant in combination with a meltdown gasifier as a pig iron source. The mill is operated in combination with a single steel converter. The direct reduction plant, on its discharge side is connected both with the meltdown gasifier and with the steel converter via sponge iron transporting devices. The meltdown gasifier communicates with the steel converter via a transport line for molten pig iron. As the solid charge in the refining process, sponge iron is exclusively used.

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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 December 6, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 6, 2011.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 27, 1987
GrantedDecember 6, 1994
Term endedDecember 6, 2011
Patent numberCA 1333335 C
Classification (IPC)C21B13/14 +2 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedJuly 27, 1987Patent grantedDec 6, 1994Term endedDec 6, 2011

Sources & verification

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