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Expired European patentEurope

Malfunction monitoring apparatus and method for secondary air supply system of internal combustion engine

EP 0663516 B1 · Applicant: HITACHI, 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 December 12, 1994 and granted May 20, 1998. A European patent lasts at most 20 years from filing, so its term ended December 12, 2014.
  • 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 12, 2020.
  • 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 12, 1994
PublishedJuly 19, 1995
GrantedMay 20, 1998
Term endedDecember 12, 2014
Application numberEP 94309242
Classification (CPC)F01N11/00 +2 more

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedDec 12, 1994PublishedJuly 19, 1995Patent grantedMay 20, 1998Term endedDec 12, 2014

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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