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Expired European patentEurope

Method and apparatus for grading fiber suspension

EP 0306022 B1 · Applicant: A. AHLSTROM 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 September 1, 1988 and granted May 29, 1991. A European patent lasts at most 20 years from filing, so its term ended September 1, 2008.
  • 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 March 1, 2014.
  • 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.
FiledSeptember 1, 1988
PublishedMarch 8, 1989
GrantedMay 29, 1991
Term endedSeptember 1, 2008
Application numberEP 88114281
Classification (CPC)D21D5/24

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedSep 1, 1988PublishedMarch 8, 1989Patent grantedMay 29, 1991Term endedSep 1, 2008

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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