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Expired European patentEurope

Process for improving the purity of transition metals obtained by electrolysis of their halides in molten salts baths

EP 0197867 B1 · Applicant: 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 March 17, 1986 and granted November 17, 1988. A European patent lasts at most 20 years from filing, so its term ended March 17, 2006.
  • 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 September 17, 2011.
  • 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.
FiledMarch 17, 1986
PublishedOctober 15, 1986
GrantedNovember 17, 1988
Term endedMarch 17, 2006
Application numberEP 86420077
Classification (CPC)C25C3/26 +1 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedMarch 17, 1986PublishedOct 15, 1986Patent grantedNov 17, 1988Term endedMarch 17, 2006

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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