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Expired European patentEurope

2,3-Bis(arylethényl)quinoxalines, process for their preparation and their use as photoconducting compounds

EP 0149802 B1 · Applicant: HOECHST AKTIENGESELLSCHAFT

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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 15, 1984 and granted September 26, 1990. A European patent lasts at most 20 years from filing, so its term ended December 15, 2004.
  • 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 15, 2010.
  • 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 15, 1984
PublishedJuly 31, 1985
GrantedSeptember 26, 1990
Term endedDecember 15, 2004
Application numberEP 84115518
Classification (CPC)C07D403/14 +2 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedDec 15, 1984PublishedJuly 31, 1985Patent grantedSep 26, 1990Term endedDec 15, 2004

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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