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Expired European patentEurope

Herbicidal sulfonamides

EP 0044211 B1 · Applicant: E.I. DU PONT DE NEMOURS AND COMPANY

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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 July 10, 1981 and granted October 22, 1986. A European patent lasts at most 20 years from filing, so its term ended July 10, 2001.
  • 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 January 10, 2007.
  • 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.
FiledJuly 10, 1981
PublishedJanuary 20, 1982
GrantedOctober 22, 1986
Term endedJuly 10, 2001
Application numberEP 81303178
Classification (CPC)C07C311/65 +2 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedJuly 10, 1981PublishedJan 20, 1982Patent grantedOct 22, 1986Term endedJuly 10, 2001

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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