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Expired European patentEurope

Treatment of scheelite concentrates containing organic matter

EP 0069780 B1 · Applicant: AMAX INC.

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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 January 19, 1982 and granted September 25, 1985. A European patent lasts at most 20 years from filing, so its term ended January 19, 2002.
  • 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 July 19, 2007.
  • 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.
FiledJanuary 19, 1982
PublishedJanuary 19, 1983
GrantedSeptember 25, 1985
Term endedJanuary 19, 2002
Application numberEP 82900727
Classification (CPC)C22B1/005 +1 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedJan 19, 1982PublishedJan 19, 1983Patent grantedSep 25, 1985Term endedJan 19, 2002

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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