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Expired European patentEurope

Derivatives of methotrexate with antirheumatic activity

EP 0543997 B1 · Applicant: Chugai Seiyaku Kabushiki Kaisha

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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 August 14, 1991 and granted December 8, 1999. A European patent lasts at most 20 years from filing, so its term ended August 14, 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 February 14, 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.
FiledAugust 14, 1991
PublishedJune 2, 1993
GrantedDecember 8, 1999
Term endedAugust 14, 2011
Application numberEP 91914615
Classification (CPC)C07D475/08 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedAug 14, 1991PublishedJune 2, 1993Patent grantedDec 8, 1999Term endedAug 14, 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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