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Expired European patentEurope

Subband acoustic echo canceller

EP 0758830 B1 · Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 August 9, 1996 and granted December 15, 2004. A European patent lasts at most 20 years from filing, so its term ended August 9, 2016.
  • 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 February 9, 2022.
  • 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.
FiledAugust 9, 1996
PublishedFebruary 19, 1997
GrantedDecember 15, 2004
Term endedAugust 9, 2016
Application numberEP 96112904
Classification (CPC)H04M9/082

Timeline

Timeline From EPO dates

1997199920012003200520072009201120132015Application filedAug 9, 1996PublishedFeb 19, 1997Patent grantedDec 15, 2004Term endedAug 9, 2016

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.