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Method and system for transmitting supplementary data signals with an audio signal as a subaudible signal

EP 0713301 A2 · Applicant: KABUSHIKI KAISHA TOSHIBA

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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 November 20, 1995 and never granted as a European patent. Had it been granted, its 20-year term would have ended November 20, 2015.
  • 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 May 20, 2021.
  • 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.
FiledNovember 20, 1995
PublishedMay 22, 1996
GrantedNever granted
Term endedNovember 20, 2015
Application numberEP 95308292
Classification (CPC)H04H20/31

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedNov 20, 1995PublishedMay 22, 1996Term endedNov 20, 2015

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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