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Expired European patentEurope

Apparatus and sensor for sensing low concentration NOx

EP 0874236 B1 · Applicant: NGK INSULATORS, LTD.

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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 April 22, 1998 and granted September 8, 2004. A European patent lasts at most 20 years from filing, so its term ended April 22, 2018.
  • 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 October 22, 2023.
  • 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.
FiledApril 22, 1998
PublishedOctober 28, 1998
GrantedSeptember 8, 2004
Term endedApril 22, 2018
Application numberEP 98303116
Classification (CPC)G01N33/0037 +2 more

Timeline

Timeline From EPO dates

1999200120032005200720092011201320152017Application filedApril 22, 1998PublishedOct 28, 1998Patent grantedSep 8, 2004Term endedApril 22, 2018

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

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