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Expired European patentEurope

Coloured water soluble compounds, process for their preparation and their use as dyestuffs

EP 0271883 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 December 15, 1987 and granted March 6, 1991. A European patent lasts at most 20 years from filing, so its term ended December 15, 2007.
  • 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 June 15, 2013.
  • 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.
FiledDecember 15, 1987
PublishedJune 22, 1988
GrantedMarch 6, 1991
Term endedDecember 15, 2007
Application numberEP 87118590
Classification (CPC)C09B62/4411

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedDec 15, 1987PublishedJune 22, 1988Patent grantedMarch 6, 1991Term endedDec 15, 2007

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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