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Expired European patentEurope

Wireless digital transmission of low frequency effects and surround channels for surround sound system

EP 1665877 B1 · Applicant: Thomson Licensing

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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 22, 2004 and granted April 5, 2017. A European patent lasts at most 20 years from filing, so its term ended September 22, 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.
FiledSeptember 22, 2004
PublishedJune 7, 2006
GrantedApril 5, 2017
Term endedSeptember 22, 2024
Application numberEP 04784704
Classification (CPC)H04R5/04

Timeline

Timeline From EPO dates

2005200720092011201320152017201920212023Application filedSep 22, 2004PublishedJune 7, 2006Patent grantedApril 5, 2017Term endedSep 22, 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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