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Expired European patentEurope

Process and apparatus for purifying, by adsorption, air to be distilled

EP 0456575 B1 · Applicant: L'AIR LIQUIDE, SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE

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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 May 7, 1991 and granted February 1, 1995. A European patent lasts at most 20 years from filing, so its term ended May 7, 2011.
  • 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 November 7, 2016.
  • 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.
FiledMay 7, 1991
PublishedNovember 13, 1991
GrantedFebruary 1, 1995
Term endedMay 7, 2011
Application numberEP 91401198
Classification (CPC)F25J3/04157 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMay 7, 1991PublishedNov 13, 1991Patent grantedFeb 1, 1995Term endedMay 7, 2011

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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