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Expired European patentEurope

Dicyclic metal complex formazan derivatives, process for producing the same, composition containing the same and dyeing process employing the same

EP 0777703 B1 · Applicant: Kyungin Synthetic Corporation

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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 April 8, 1996 and granted June 25, 2003. A European patent lasts at most 20 years from filing, so its term ended April 8, 2016.
  • 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 October 8, 2021.
  • 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.
FiledApril 8, 1996
PublishedJune 11, 1997
GrantedJune 25, 2003
Term endedApril 8, 2016
Application numberEP 96909386
Classification (CPC)C09B50/00 +1 more

Timeline

Timeline From EPO dates

1997199920012003200520072009201120132015Application filedApril 8, 1996PublishedJune 11, 1997Patent grantedJune 25, 2003Term endedApril 8, 2016

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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