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Expired European patentEurope

Process for selectively extracting copper using 4-acyl(3H)-pyrazol-3-ones

EP 0129448 B1 · Applicant: SOCIETE NATIONALE DES POUDRES ET EXPLOSIFS

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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 April 10, 1984 and granted February 10, 1988. A European patent lasts at most 20 years from filing, so its term ended April 10, 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 October 10, 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.
FiledApril 10, 1984
PublishedDecember 27, 1984
GrantedFebruary 10, 1988
Term endedApril 10, 2004
Application numberEP 84400700
Classification (CPC)C07D231/22 +2 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedApril 10, 1984PublishedDec 27, 1984Patent grantedFeb 10, 1988Term endedApril 10, 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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