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Expired European patentEurope

Multistage brightening of high yield and ultra high-yield wood pulps

EP 0187477 B1 · Applicant: Pulp and Paper Research Institute of Canada

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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 December 5, 1985 and granted July 19, 1989. A European patent lasts at most 20 years from filing, so its term ended December 5, 2005.
  • 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 5, 2011.
  • 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 5, 1985
PublishedJuly 16, 1986
GrantedJuly 19, 1989
Term endedDecember 5, 2005
Application numberEP 85308862
Classification (CPC)D21C9/1057

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedDec 5, 1985PublishedJuly 16, 1986Patent grantedJuly 19, 1989Term endedDec 5, 2005

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.