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Expired European patentEurope

Method and apparatus for measuring NOx gas concentration

EP 1077375 B1 · Applicant: NGK SPARK PLUG CO., 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 March 23, 1998 and granted June 20, 2012. A European patent lasts at most 20 years from filing, so its term ended March 23, 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 September 23, 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.
FiledMarch 23, 1998
PublishedFebruary 21, 2001
GrantedJune 20, 2012
Term endedMarch 23, 2018
Application numberEP 00109915
Classification (CPC)F01N11/00 +2 more

Timeline

Timeline From EPO dates

1999200120032005200720092011201320152017Application filedMarch 23, 1998PublishedFeb 21, 2001Patent grantedJune 20, 2012Term endedMarch 23, 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

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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