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Expired European patentEurope

Process for shutting down and restarting an electrolytic refining plant

EP 0255451 B1 · Applicant: COMPAGNIE GENERALE D'ELECTROLYSE DU PALAIS

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 June 22, 1987 and granted September 12, 1990. A European patent lasts at most 20 years from filing, so its term ended June 22, 2007.
  • 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 December 22, 2012.
  • 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.
FiledJune 22, 1987
PublishedFebruary 3, 1988
GrantedSeptember 12, 1990
Term endedJune 22, 2007
Application numberEP 87420172
Classification (CPC)C25C1/12 +1 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedJune 22, 1987PublishedFeb 3, 1988Patent grantedSep 12, 1990Term endedJune 22, 2007

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.