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Expired European patentEurope

Process for separating metalions more electropositive than iron from process andwaste waters

EP 0495223 B1 · Applicant: BASF Aktiengesellschaft

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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 December 19, 1991 and granted March 9, 1994. A European patent lasts at most 20 years from filing, so its term ended December 19, 2011.
  • 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 June 19, 2017.
  • 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.
FiledDecember 19, 1991
PublishedJuly 22, 1992
GrantedMarch 9, 1994
Term endedDecember 19, 2011
Application numberEP 91121770
Classification (CPC)C02F1/70 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedDec 19, 1991PublishedJuly 22, 1992Patent grantedMarch 9, 1994Term endedDec 19, 2011

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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