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Expired European patentEurope

Method for preparing 2-phenylbenzotriazoles and 2-phenylbenzotriazole-N-oxides

EP 0257151 B1 · Applicant: CHEMIPRO KASEI KAISHA, 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 August 22, 1986 and granted January 29, 1992. A European patent lasts at most 20 years from filing, so its term ended August 22, 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 February 22, 2012.
  • 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 22, 1986
PublishedMarch 2, 1988
GrantedJanuary 29, 1992
Term endedAugust 22, 2006
Application numberEP 86306514
Classification (CPC)C07D249/20

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedAug 22, 1986PublishedMarch 2, 1988Patent grantedJan 29, 1992Term endedAug 22, 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

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