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Expired European patentEurope

Condensation chimney

EP 0689656 B1 · Applicant: Wunsch, Horst

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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 September 27, 1994 and granted July 28, 1999. A European patent lasts at most 20 years from filing, so its term ended September 27, 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 March 27, 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.
FiledSeptember 27, 1994
PublishedJanuary 3, 1996
GrantedJuly 28, 1999
Term endedSeptember 27, 2014
Application numberEP 94926765
Classification (CPC)F24D12/02 +1 more

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

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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.