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Expired European patentEurope

Channel for purging combustion gases of a boiler installation

EP 0443440 B1 · Applicant: Vetter, Richard

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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 February 14, 1991 and granted April 13, 1994. A European patent lasts at most 20 years from filing, so its term ended February 14, 2011.
  • 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 August 14, 2016.
  • 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.
FiledFebruary 14, 1991
PublishedAugust 28, 1991
GrantedApril 13, 1994
Term endedFebruary 14, 2011
Application numberEP 91102083
Classification (CPC)F28D21/0007

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedFeb 14, 1991PublishedAug 28, 1991Patent grantedApril 13, 1994Term endedFeb 14, 2011

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.