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Expired European patentEurope

Sulfamidosulfonylurea derivatives and herbicides

EP 0452500 B1 · Applicant: NISSAN CHEMICAL INDUSTRIES, LIMITED

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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 October 19, 1990 and granted March 12, 1997. A European patent lasts at most 20 years from filing, so its term ended October 19, 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 April 19, 2016.
  • 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.
FiledOctober 19, 1990
PublishedOctober 23, 1991
GrantedMarch 12, 1997
Term endedOctober 19, 2010
Application numberEP 90915183
Classification (CPC)C07D521/00

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedOct 19, 1990PublishedOct 23, 1991Patent grantedMarch 12, 1997Term endedOct 19, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.