Expired Canadian patentCanada
Improvements to melt discharge of blast furnaces
CA 1234980 A · Owner: Union Siderurgique Du Nord Et De L'Est De La France, "Usinor" · Inventors: Rollot, Pierre
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead 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
- Granted April 12, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 12, 2005.
- 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 16, 1984
GrantedApril 12, 1988
Term endedApril 12, 2005
Patent numberCA 1234980 A
Classification (IPC)C21B7/06
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.