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Expired European patentEurope

Method for the preparation of 4-amino-3-ethylthio-6-tert.-butyl-1,2,4-triazine-5-one virtually free of isomers

EP 0144669 B1 · Applicant: BAYER AG

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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 October 22, 1984 and granted March 18, 1987. A European patent lasts at most 20 years from filing, so its term ended October 22, 2004.
  • 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 April 22, 2010.
  • 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.
FiledOctober 22, 1984
PublishedJune 19, 1985
GrantedMarch 18, 1987
Term endedOctober 22, 2004
Application numberEP 84112711
Classification (CPC)C07D253/075

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedOct 22, 1984PublishedJune 19, 1985Patent grantedMarch 18, 1987Term endedOct 22, 2004

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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