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Expired European patentEurope

Multi-channel audio surround sound from front located loudspeakers

EP 1680941 B1 · Applicant: Britannia Investment Corporation

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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 October 25, 2004 and granted April 25, 2012. A European patent lasts at most 20 years from filing, so its term ended October 25, 2024.
  • 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.
FiledOctober 25, 2004
PublishedJuly 19, 2006
GrantedApril 25, 2012
Term endedOctober 25, 2024
Application numberEP 04796262
Classification (CPC)H04S3/002

Timeline

Timeline From EPO dates

2005200720092011201320152017201920212023Application filedOct 25, 2004PublishedJuly 19, 2006Patent grantedApril 25, 2012Term endedOct 25, 2024

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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