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Expired European patentEurope

Method for the preparation of 1:2-chromium complex azo-dyestuffs

EP 0157733 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 March 4, 1985 and granted April 20, 1988. A European patent lasts at most 20 years from filing, so its term ended March 4, 2005.
  • 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 September 4, 2010.
  • 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.
FiledMarch 4, 1985
PublishedOctober 9, 1985
GrantedApril 20, 1988
Term endedMarch 4, 2005
Application numberEP 85810090
Classification (CPC)C09B45/01

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedMarch 4, 1985PublishedOct 9, 1985Patent grantedApril 20, 1988Term endedMarch 4, 2005

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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