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Expired European patentEurope

Water soluble triphenedioxazine compounds, process for their preparation and their use as dyestuffs

EP 0168751 B1 · Applicant: HOECHST AKTIENGESELLSCHAFT

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Overview

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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 9, 1985 and granted February 8, 1989. A European patent lasts at most 20 years from filing, so its term ended July 9, 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 January 9, 2011.
  • 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 9, 1985
PublishedJanuary 22, 1986
GrantedFebruary 8, 1989
Term endedJuly 9, 2005
Application numberEP 85108476
Classification (CPC)C09B62/5033

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedJuly 9, 1985PublishedJan 22, 1986Patent grantedFeb 8, 1989Term endedJuly 9, 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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