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Expired European patentEurope

Process for the separation of butanes and butenes by extractive distillation

EP 0501848 B1 · Applicant: INSTITUT FRANCAIS DU PETROLE

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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 February 17, 1992 and granted August 9, 1995. A European patent lasts at most 20 years from filing, so its term ended February 17, 2012.
  • 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 August 17, 2017.
  • 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.
FiledFebruary 17, 1992
PublishedSeptember 2, 1992
GrantedAugust 9, 1995
Term endedFebruary 17, 2012
Application numberEP 92400410
Classification (CPC)C07C7/08

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedFeb 17, 1992PublishedSep 2, 1992Patent grantedAug 9, 1995Term endedFeb 17, 2012

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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