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Expired European patentEurope

A process for the recovery of valuable metals from the ashes of normal and complex pyrites

EP 0134435 B1 · Applicant: COMPANIA ESPANOLA DE MINAS DE THARSIS, S.A.

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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 18, 1984 and granted October 19, 1988. A European patent lasts at most 20 years from filing, so its term ended June 18, 2004.
  • 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 18, 2009.
  • 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 18, 1984
PublishedMarch 20, 1985
GrantedOctober 19, 1988
Term endedJune 18, 2004
Application numberEP 84106957
Classification (CPC)C22B7/02 +2 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedJune 18, 1984PublishedMarch 20, 1985Patent grantedOct 19, 1988Term endedJune 18, 2004

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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