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Expired European patentEurope

Blast furnaces tap-hole area modification

EP 0143695 B1 · Applicant: UNION SIDERURGIQUE DU NORD ET DE L'EST DE LA FRANCE par abréviation "USINOR"

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Overview

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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed November 15, 1984 and granted March 11, 1987. A European patent lasts at most 20 years from filing, so its term ended November 15, 2004.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by May 15, 2010.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledNovember 15, 1984
PublishedJune 5, 1985
GrantedMarch 11, 1987
Term endedNovember 15, 2004
Application numberEP 84402328
Classification (CPC)C21B7/06

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedNov 15, 1984PublishedJune 5, 1985Patent grantedMarch 11, 1987Term endedNov 15, 2004

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.