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Expired European patentEurope

Method for production of maleimides

EP 0334497 B1 · Applicant: NIPPON SHOKUBAI CO., LTD.

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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 February 28, 1989 and granted May 15, 2002. A European patent lasts at most 20 years from filing, so its term ended February 28, 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 August 28, 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.
FiledFebruary 28, 1989
PublishedSeptember 27, 1989
GrantedMay 15, 2002
Term endedFebruary 28, 2009
Application numberEP 89301970
Classification (CPC)C07D401/04 +1 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedFeb 28, 1989PublishedSep 27, 1989Patent grantedMay 15, 2002Term endedFeb 28, 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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