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Expired European patentEurope

Process for preparing amino anthraquinones

EP 0064629 B1 · Applicant: BASF 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 April 21, 1982 and granted October 26, 1983. A European patent lasts at most 20 years from filing, so its term ended April 21, 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 October 21, 2007.
  • 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 21, 1982
PublishedNovember 17, 1982
GrantedOctober 26, 1983
Term endedApril 21, 2002
Application numberEP 82103362
Classification (CPC)C07C225/34

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedApril 21, 1982PublishedNov 17, 1982Patent grantedOct 26, 1983Term endedApril 21, 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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