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Expired European patentEurope

Digital echo canceller

EP 0082529 B1 · Applicant: COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL S.A. dite:

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Overview

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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 December 21, 1982 and granted June 19, 1985. A European patent lasts at most 20 years from filing, so its term ended December 21, 2002.
  • 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 June 21, 2008.
  • 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.
FiledDecember 21, 1982
PublishedJune 29, 1983
GrantedJune 19, 1985
Term endedDecember 21, 2002
Application numberEP 82111852
Classification (CPC)H04B3/23

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedDec 21, 1982PublishedJune 29, 1983Patent grantedJune 19, 1985Term endedDec 21, 2002

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.