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Expired European patentEurope

Synthesis of N-t-alkyl-1,2-diacylhydrazines

EP 0339854 B1 · Applicant: ROHM AND HAAS COMPANY

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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 18, 1989 and granted May 26, 1993. A European patent lasts at most 20 years from filing, so its term ended April 18, 2009.
  • 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 18, 2014.
  • 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 18, 1989
PublishedNovember 2, 1989
GrantedMay 26, 1993
Term endedApril 18, 2009
Application numberEP 89303845
Classification (CPC)C07C241/04

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedApril 18, 1989PublishedNov 2, 1989Patent grantedMay 26, 1993Term endedApril 18, 2009

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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