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Expired European patentEurope

Method for the treatment of a gas mixture by adsorpton

EP 0227771 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 July 4, 1986 and granted August 29, 1990. A European patent lasts at most 20 years from filing, so its term ended July 4, 2006.
  • 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 4, 2012.
  • 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 4, 1986
PublishedJuly 8, 1987
GrantedAugust 29, 1990
Term endedJuly 4, 2006
Application numberEP 86904210
Classification (CPC)B01D53/0476

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedJuly 4, 1986PublishedJuly 8, 1987Patent grantedAug 29, 1990Term endedJuly 4, 2006

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.