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Expired European patentEurope

Method of operating a diesel engine utilizing a continuously powered glow plug, and glow plug design therefor

EP 0657634 B1 · Applicant: DETROIT DIESEL CORPORATION

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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 October 12, 1994 and granted December 10, 1997. A European patent lasts at most 20 years from filing, so its term ended October 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 April 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.
FiledOctober 12, 1994
PublishedJune 14, 1995
GrantedDecember 10, 1997
Term endedOctober 12, 2014
Application numberEP 94307481
Classification (CPC)F02P19/026

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedOct 12, 1994PublishedJune 14, 1995Patent grantedDec 10, 1997Term endedOct 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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