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Expired European patentEurope

A method for cleaning gas mixtures which might contain dust from a urea plant

EP 0084669 B1 · Applicant: NORSK HYDRO A/S

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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 December 23, 1982 and granted February 26, 1986. A European patent lasts at most 20 years from filing, so its term ended December 23, 2002.
  • 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 June 23, 2008.
  • 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.
FiledDecember 23, 1982
PublishedAugust 3, 1983
GrantedFebruary 26, 1986
Term endedDecember 23, 2002
Application numberEP 82111944
Classification (CPC)C07C273/02 +1 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedDec 23, 1982PublishedAug 3, 1983Patent grantedFeb 26, 1986Term endedDec 23, 2002

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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