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Expired European patentEurope

Process for removing transition metal ions from an aqueous solution with a reticular ion exchange resin containing a crystalline transition metal aluminate

EP 0094983 B1 · Applicant: THE DOW CHEMICAL COMPANY

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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 May 26, 1982 and granted December 13, 1989. A European patent lasts at most 20 years from filing, so its term ended May 26, 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 November 26, 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.
FiledMay 26, 1982
PublishedNovember 30, 1983
GrantedDecember 13, 1989
Term endedMay 26, 2002
Application numberEP 82104599
Classification (CPC)C01G37/14 +2 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedMay 26, 1982PublishedNov 30, 1983Patent grantedDec 13, 1989Term endedMay 26, 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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