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Expired European patentEurope

Process for the removal of the slag from molten mixtures of slag and silicon

EP 0089009 B1 · Applicant: HELIOTRONIC Forschungs- und Entwicklungsgesellschaft für Solarzellen-Grundstoffe mbH

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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 10, 1983 and granted January 15, 1986. A European patent lasts at most 20 years from filing, so its term ended March 10, 2003.
  • 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 10, 2008.
  • 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 10, 1983
PublishedSeptember 21, 1983
GrantedJanuary 15, 1986
Term endedMarch 10, 2003
Application numberEP 83102340
Classification (CPC)C22B9/02 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedMarch 10, 1983PublishedSep 21, 1983Patent grantedJan 15, 1986Term endedMarch 10, 2003

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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