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Expired European patentEurope

Method of preparing naphthalocyanines

EP 0692002 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 March 18, 1994 and granted December 27, 1996. A European patent lasts at most 20 years from filing, so its term ended March 18, 2014.
  • 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 18, 2019.
  • 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 18, 1994
PublishedJanuary 17, 1996
GrantedDecember 27, 1996
Term endedMarch 18, 2014
Application numberEP 94911925
Classification (CPC)C07D487/22 +2 more

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedMarch 18, 1994PublishedJan 17, 1996Patent grantedDec 27, 1996Term endedMarch 18, 2014

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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