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Expired European patentEurope

N'-substituted N-amino-3,4,5,6-tetrafluorophthalimides and processes for their preparation

EP 0510491 B1 · Applicant: HOECHST AKTIENGESELLSCHAFT

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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 14, 1992 and granted August 3, 1994. A European patent lasts at most 20 years from filing, so its term ended April 14, 2012.
  • 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 14, 2017.
  • 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 14, 1992
PublishedOctober 28, 1992
GrantedAugust 3, 1994
Term endedApril 14, 2012
Application numberEP 92106419
Classification (CPC)C07D209/48

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedApril 14, 1992PublishedOct 28, 1992Patent grantedAug 3, 1994Term endedApril 14, 2012

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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