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Expired European patentEurope

Derivatives of 2,4,6-triodo-isophthalic acid, process for their preparation and X-ray contrast agents containing them

EP 0023992 B1 · Applicant: BRACCO INDUSTRIA CHIMICA Società per Azioni

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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 July 18, 1980 and granted June 23, 1982. A European patent lasts at most 20 years from filing, so its term ended July 18, 2000.
  • 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 January 18, 2006.
  • 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.
FiledJuly 18, 1980
PublishedFebruary 18, 1981
GrantedJune 23, 1982
Term endedJuly 18, 2000
Application numberEP 80104242
Classification (CPC)C07C233/00

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedJuly 18, 1980PublishedFeb 18, 1981Patent grantedJune 23, 1982Term endedJuly 18, 2000

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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