Expired Canadian patentCanada
Operating method of a smelter, namely a steelworks blast furnace
CA 1256703 A · Owner: Institut De Recherches De La Siderurgie Francaise (Irsid) · Inventors: De Saint Martin, Lucien; Michard, Jean-Alex
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
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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 July 4, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 4, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 20, 1985
GrantedJuly 4, 1989
Term endedJuly 4, 2006
Patent numberCA 1256703 A
Classification (IPC)C21B5/02 +1 more
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.