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Expired European patentEurope

Cryogenic air separation process with production of high-pressure oxygen

EP 0024962 B1 · Applicant: L'AIR LIQUIDE, SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE

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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 July 11, 1980 and granted September 8, 1982. A European patent lasts at most 20 years from filing, so its term ended July 11, 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 January 11, 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.
FiledJuly 11, 1980
PublishedMarch 11, 1981
GrantedSeptember 8, 1982
Term endedJuly 11, 2000
Application numberEP 80401045
Classification (CPC)F25J3/04412 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedJuly 11, 1980PublishedMarch 11, 1981Patent grantedSep 8, 1982Term endedJuly 11, 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

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