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Expired European patentEurope

Process and plant for the cryogenic purification of hydrogen

EP 0655596 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 October 10, 1994 and granted August 27, 1997. A European patent lasts at most 20 years from filing, so its term ended October 10, 2014.
  • 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 April 10, 2020.
  • 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.
FiledOctober 10, 1994
PublishedMay 31, 1995
GrantedAugust 27, 1997
Term endedOctober 10, 2014
Application numberEP 94402267
Classification (CPC)F25J3/0695 +2 more

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedOct 10, 1994PublishedMay 31, 1995Patent grantedAug 27, 1997Term endedOct 10, 2014

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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