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Expired European patentEurope

5-aminoflavone derivatives

EP 0755928 B1 · Applicant: KYOWA HAKKO KOGYO CO., Ltd.

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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 January 31, 1996 and granted April 10, 2002. A European patent lasts at most 20 years from filing, so its term ended January 31, 2016.
  • 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 July 31, 2021.
  • 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.
FiledJanuary 31, 1996
PublishedJanuary 29, 1997
GrantedApril 10, 2002
Term endedJanuary 31, 2016
Application numberEP 96901492
Classification (CPC)C07D311/30

Timeline

Timeline From EPO dates

1997199920012003200520072009201120132015Application filedJan 31, 1996PublishedJan 29, 1997Patent grantedApril 10, 2002Term endedJan 31, 2016

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.