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Expired European patentEurope

A method for heating and cooling pulps and a heat exchanger and plant for applying the method

EP 0275502 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 December 17, 1987 and granted October 7, 1992. A European patent lasts at most 20 years from filing, so its term ended December 17, 2007.
  • 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 17, 2013.
  • 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 17, 1987
PublishedJuly 27, 1988
GrantedOctober 7, 1992
Term endedDecember 17, 2007
Application numberEP 87118725
Classification (CPC)D21C9/00 +1 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedDec 17, 1987PublishedJuly 27, 1988Patent grantedOct 7, 1992Term endedDec 17, 2007

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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