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Expired European patentEurope

Tetrahydrophthalimides, their preparation and use

EP 0834503 B1 · Applicant: BASF 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 20, 1993 and granted June 27, 2001. A European patent lasts at most 20 years from filing, so its term ended April 20, 2013.
  • 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 20, 2018.
  • 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 20, 1993
PublishedApril 8, 1998
GrantedJune 27, 2001
Term endedApril 20, 2013
Application numberEP 97118857
Classification (CPC)C07D339/08 +2 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedApril 20, 1993PublishedApril 8, 1998Patent grantedJune 27, 2001Term endedApril 20, 2013

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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