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Expired European patentEurope

Method for preventing slopping during subsurface pneumatic refining of steel

EP 0033780 B1 · Applicant: UNION CARBIDE CORPORATION

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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 December 23, 1980 and granted October 9, 1985. A European patent lasts at most 20 years from filing, so its term ended December 23, 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 June 23, 2006.
  • 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.
FiledDecember 23, 1980
PublishedAugust 19, 1981
GrantedOctober 9, 1985
Term endedDecember 23, 2000
Application numberEP 80108124
Classification (CPC)C21C7/00 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedDec 23, 1980PublishedAug 19, 1981Patent grantedOct 9, 1985Term endedDec 23, 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

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