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Expired European patentEurope

Novel benzopyran derivatives and processes for the preparation thereof

EP 0514935 B1 · Applicant: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY

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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 May 22, 1992 and granted November 8, 1995. A European patent lasts at most 20 years from filing, so its term ended May 22, 2012.
  • 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 November 22, 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.
FiledMay 22, 1992
PublishedNovember 25, 1992
GrantedNovember 8, 1995
Term endedMay 22, 2012
Application numberEP 92108703
Classification (CPC)C07D405/14 +2 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedMay 22, 1992PublishedNov 25, 1992Patent grantedNov 8, 1995Term endedMay 22, 2012

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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