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Expired European patentEurope

Process for producing desulfurizing agents for pig iron or steel melts

EP 0019086 B1 · Applicant: HOECHST AKTIENGESELLSCHAFT

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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 April 14, 1980 and granted December 22, 1982. A European patent lasts at most 20 years from filing, so its term ended April 14, 2000.
  • 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 October 14, 2005.
  • 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.
FiledApril 14, 1980
PublishedNovember 26, 1980
GrantedDecember 22, 1982
Term endedApril 14, 2000
Application numberEP 80101984
Classification (CPC)C21C1/025 +1 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedApril 14, 1980PublishedNov 26, 1980Patent grantedDec 22, 1982Term endedApril 14, 2000

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.