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Expired European patentEurope

Removal of carbonyl impurities from a carbonylation process stream

EP 0487284 B1 · Applicant: HOECHST CELANESE CORPORATION

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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 November 18, 1991 and granted April 12, 1995. A European patent lasts at most 20 years from filing, so its term ended November 18, 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 May 18, 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.
FiledNovember 18, 1991
PublishedMay 27, 1992
GrantedApril 12, 1995
Term endedNovember 18, 2011
Application numberEP 91310619
Classification (CPC)C07C51/12 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedNov 18, 1991PublishedMay 27, 1992Patent grantedApril 12, 1995Term endedNov 18, 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

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