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Expired European patentEurope

Soot blowing system

EP 0023937 B1 · Applicant: Michelson, Herb

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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 August 10, 1979 and granted July 4, 1984. A European patent lasts at most 20 years from filing, so its term ended August 10, 1999.
  • 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 10, 2005.
  • 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 10, 1979
PublishedFebruary 18, 1981
GrantedJuly 4, 1984
Term endedAugust 10, 1999
Application numberEP 79301627
Classification (CPC)F28G15/04 +1 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedAug 10, 1979PublishedFeb 18, 1981Patent grantedJuly 4, 1984Term endedAug 10, 1999

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.