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Expired European patentEurope

Process and device for suppressing magnetic disturbances in electrolytic cells

EP 0047246 B1 · Applicant: ALUMINIUM PECHINEY

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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 4, 1980 and granted January 23, 1985. A European patent lasts at most 20 years from filing, so its term ended November 4, 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 May 4, 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.
FiledNovember 4, 1980
PublishedMarch 17, 1982
GrantedJanuary 23, 1985
Term endedNovember 4, 2000
Application numberEP 80902175
Classification (CPC)C25C3/16

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedNov 4, 1980PublishedMarch 17, 1982Patent grantedJan 23, 1985Term endedNov 4, 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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