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Expired European patentEurope

Water-soluble polyazo dyestuffs, their preparation and their use

EP 0073387 B1 · Applicant: CASSELLA 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 August 14, 1982 and granted December 27, 1984. A European patent lasts at most 20 years from filing, so its term ended August 14, 2002.
  • 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 February 14, 2008.
  • 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.
FiledAugust 14, 1982
PublishedMarch 9, 1983
GrantedDecember 27, 1984
Term endedAugust 14, 2002
Application numberEP 82107403
Classification (CPC)C09B35/50 +1 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedAug 14, 1982PublishedMarch 9, 1983Patent grantedDec 27, 1984Term endedAug 14, 2002

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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