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Expired European patentEurope

Process for preparing derivatives of naphthazarin

EP 0200219 B1 · Applicant: NIPPON OIL CO. LTD.

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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 30, 1986 and granted February 6, 1991. A European patent lasts at most 20 years from filing, so its term ended April 30, 2006.
  • 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 30, 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.
FiledApril 30, 1986
PublishedNovember 5, 1986
GrantedFebruary 6, 1991
Term endedApril 30, 2006
Application numberEP 86105957
Classification (CPC)C07D307/12

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedApril 30, 1986PublishedNov 5, 1986Patent grantedFeb 6, 1991Term endedApril 30, 2006

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.