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Expired European patentEurope

Process for the preparation of anthraquinone

EP 0188979 B1 · Applicant: ELF ATOCHEM S.A.

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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 19, 1985 and granted March 9, 1988. A European patent lasts at most 20 years from filing, so its term ended December 19, 2005.
  • 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 19, 2011.
  • 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 19, 1985
PublishedJuly 30, 1986
GrantedMarch 9, 1988
Term endedDecember 19, 2005
Application numberEP 85420233
Classification (CPC)C07C46/00

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedDec 19, 1985PublishedJuly 30, 1986Patent grantedMarch 9, 1988Term endedDec 19, 2005

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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