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Expired European patentEurope

Membrane for a dynamic converter

EP 1854331 B1 · Applicant: AKG Acoustics GmbH

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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 16, 2006 and granted May 22, 2013. A European patent lasts at most 20 years from filing, so its term ended February 16, 2026.
  • Supplementary protection certificates extend only medicine and crop-protection patents, and it isn't classified as either.
  • 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 16, 2006
PublishedNovember 14, 2007
GrantedMay 22, 2013
Term endedFebruary 16, 2026
Application numberEP 06707033
Classification (CPC)H04R7/12

Timeline

Timeline From EPO dates

2007200920112013201520172019202120232025Application filedFeb 16, 2006PublishedNov 14, 2007Patent grantedMay 22, 2013Term endedFeb 16, 2026

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.