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Expired European patentEurope

Chemical tablet with central hole and partially exposed top and bottom

EP 0526476 B1 · Applicant: OLIN CORPORATION

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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 March 22, 1991 and granted September 20, 1995. A European patent lasts at most 20 years from filing, so its term ended March 22, 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 September 22, 2016.
  • 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.
FiledMarch 22, 1991
PublishedFebruary 10, 1993
GrantedSeptember 20, 1995
Term endedMarch 22, 2011
Application numberEP 91907103
Classification (CPC)C02F1/688

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMarch 22, 1991PublishedFeb 10, 1993Patent grantedSep 20, 1995Term endedMarch 22, 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

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