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Expired European patentEurope

3- and 4-Azidophthalic acid derivatives and process for their preparation

EP 0002181 B1 · Applicant: CIBA-GEIGY AG

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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 October 6, 1978 and granted July 22, 1981. A European patent lasts at most 20 years from filing, so its term ended October 6, 1998.
  • 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 April 6, 2004.
  • 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.
FiledOctober 6, 1978
PublishedJune 13, 1979
GrantedJuly 22, 1981
Term endedOctober 6, 1998
Application numberEP 78101082
Classification (CPC)C07D209/48 +2 more

Timeline

Timeline From EPO dates

1979198119831985198719891991199319951997Application filedOct 6, 1978PublishedJune 13, 1979Patent grantedJuly 22, 1981Term endedOct 6, 1998

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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