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Expired European patentEurope

Alkali metal ferrates

EP 0059622 B1 · Applicant: Thompson, John Alfred

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Overview

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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 February 26, 1982 and granted January 14, 1987. A European patent lasts at most 20 years from filing, so its term ended February 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 August 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.
FiledFebruary 26, 1982
PublishedSeptember 8, 1982
GrantedJanuary 14, 1987
Term endedFebruary 26, 2002
Application numberEP 82300997
Classification (CPC)C01G49/0081

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedFeb 26, 1982PublishedSep 8, 1982Patent grantedJan 14, 1987Term endedFeb 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.