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Expired European patentEurope

New macrocyclic nitrogen ligands, method for their preparation, metal complexes, diagnostic and therapeutic compositions

EP 0499501 B1 · Applicant: GUERBET S.A.

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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 22, 1992 and granted August 19, 1998. A European patent lasts at most 20 years from filing, so its term ended January 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 July 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.
FiledJanuary 22, 1992
PublishedAugust 19, 1992
GrantedAugust 19, 1998
Term endedJanuary 22, 2012
Application numberEP 92400174
Classification (CPC)C07D493/04 +2 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedJan 22, 1992PublishedAug 19, 1992Patent grantedAug 19, 1998Term endedJan 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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