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Expired European patentEurope

Hydrometallurgical treatment for the purification of waelz oxides through lixiviation with sodium carbonate

EP 0773301 B1 · Applicant: Compania Industrial Asua-Erandio, S.A.(Aser 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 April 10, 1996 and granted December 1, 1999. A European patent lasts at most 20 years from filing, so its term ended April 10, 2016.
  • 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, 2021.
  • 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, 1996
PublishedMay 14, 1997
GrantedDecember 1, 1999
Term endedApril 10, 2016
Application numberEP 96909176
Classification (CPC)C22B19/28 +2 more

Timeline

Timeline From EPO dates

1997199920012003200520072009201120132015Application filedApril 10, 1996PublishedMay 14, 1997Patent grantedDec 1, 1999Term endedApril 10, 2016

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

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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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