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Expired European patentEurope

Sulfonamide derivative and pharmaceutical composition containing the same

EP 0471841 B1 · Applicant: Asahi Kasei Kogyo Kabushiki Kaisha

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Overview

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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 March 8, 1990 and granted November 2, 1995. A European patent lasts at most 20 years from filing, so its term ended March 8, 2010.
  • 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 September 8, 2015.
  • 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.
FiledMarch 8, 1990
PublishedFebruary 26, 1992
GrantedNovember 2, 1995
Term endedMarch 8, 2010
Application numberEP 90904424
Classification (CPC)C07D405/14 +2 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedMarch 8, 1990PublishedFeb 26, 1992Patent grantedNov 2, 1995Term endedMarch 8, 2010

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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