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Expired European patentEurope

Bleaching of lignocellulosic material with dioxiranes

EP 0515362 B1 · Applicant: Pulp and Paper Research Institute of Canada

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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 16, 1990 and granted May 11, 1994. A European patent lasts at most 20 years from filing, so its term ended February 16, 2010.
  • 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 16, 2015.
  • 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 16, 1990
PublishedDecember 2, 1992
GrantedMay 11, 1994
Term endedFebruary 16, 2010
Application numberEP 90903735
Classification (CPC)D21C9/16 +2 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedFeb 16, 1990PublishedDec 2, 1992Patent grantedMay 11, 1994Term endedFeb 16, 2010

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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