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Expired European patentEurope

Method of selectively closing the ends of a honeycomb structure

EP 0025735 B1 · Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et Industriel

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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 August 22, 1980 and granted March 9, 1983. A European patent lasts at most 20 years from filing, so its term ended August 22, 2000.
  • 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 February 22, 2006.
  • 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.
FiledAugust 22, 1980
PublishedMarch 25, 1981
GrantedMarch 9, 1983
Term endedAugust 22, 2000
Application numberEP 80401207
Classification (CPC)F28F21/04 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedAug 22, 1980PublishedMarch 25, 1981Patent grantedMarch 9, 1983Term endedAug 22, 2000

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.