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Expired European patentEurope

Process for working up the cumene recovered from the Hock-synthesis of phenol

EP 0014770 B1 · Applicant: CHEMISCHE WERKE HÜLS AG

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Overview

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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 December 24, 1979 and granted September 2, 1981. A European patent lasts at most 20 years from filing, so its term ended December 24, 1999.
  • 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 June 24, 2005.
  • 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.
FiledDecember 24, 1979
PublishedSeptember 3, 1980
GrantedSeptember 2, 1981
Term endedDecember 24, 1999
Application numberEP 79105372
Classification (CPC)C07C7/177

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedDec 24, 1979PublishedSep 3, 1980Patent grantedSep 2, 1981Term endedDec 24, 1999

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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