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Expired European patentEurope

METHOD FOR MAKING CERTAIN PYRANO 3',4':6,7]INDOLIZINO 1,2-b]QUINOLINONES

EP 0550621 B1 · Applicant: SMITHKLINE BEECHAM 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 September 23, 1991 and granted November 11, 1998. A European patent lasts at most 20 years from filing, so its term ended September 23, 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 March 23, 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.
FiledSeptember 23, 1991
PublishedJuly 14, 1993
GrantedNovember 11, 1998
Term endedSeptember 23, 2011
Application numberEP 91917720
Classification (CPC)C07D471/14

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedSep 23, 1991PublishedJuly 14, 1993Patent grantedNov 11, 1998Term endedSep 23, 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

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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