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Expired European patentEurope

Improved fault detection in a flame scanner

EP 0047421 B1 · Applicant: COMBUSTION ENGINEERING, INC.

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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 August 24, 1981 and granted January 2, 1985. A European patent lasts at most 20 years from filing, so its term ended August 24, 2001.
  • 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 February 24, 2007.
  • 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.
FiledAugust 24, 1981
PublishedMarch 17, 1982
GrantedJanuary 2, 1985
Term endedAugust 24, 2001
Application numberEP 81106559
Classification (CPC)F23N5/082

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedAug 24, 1981PublishedMarch 17, 1982Patent grantedJan 2, 1985Term endedAug 24, 2001

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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