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Expired European patentEurope

Bleaching of chemical pulp and treatment with a chelating agent

EP 1030943 B1 · Applicant: KEMIRA CHEMICALS OY

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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 November 13, 1998 and granted February 13, 2002. A European patent lasts at most 20 years from filing, so its term ended November 13, 2018.
  • 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 May 13, 2024.
  • 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.
FiledNovember 13, 1998
PublishedAugust 30, 2000
GrantedFebruary 13, 2002
Term endedNovember 13, 2018
Application numberEP 98955593
Classification (CPC)D21C9/1057 +2 more

Timeline

Timeline From EPO dates

1999200120032005200720092011201320152017Application filedNov 13, 1998PublishedAug 30, 2000Patent grantedFeb 13, 2002Term endedNov 13, 2018

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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