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Expired European patentEurope

Method and system for processing of pre-echos of a frequency transform coded digital audio signal

EP 0506535 B1 · Applicant: FRANCE TELECOM

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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 March 23, 1992 and granted November 29, 1995. A European patent lasts at most 20 years from filing, so its term ended March 23, 2012.
  • 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 September 23, 2017.
  • 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.
FiledMarch 23, 1992
PublishedSeptember 30, 1992
GrantedNovember 29, 1995
Term endedMarch 23, 2012
Application numberEP 92400775
Classification (CPC)H04B1/66 +1 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedMarch 23, 1992PublishedSep 30, 1992Patent grantedNov 29, 1995Term endedMarch 23, 2012

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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