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Expired European patentEurope

Digital bidirectional transmission system with echo-cancellation

EP 0156348 B1 · Applicant: CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A.

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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 March 25, 1985 and granted July 25, 1990. A European patent lasts at most 20 years from filing, so its term ended March 25, 2005.
  • 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 25, 2010.
  • 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 25, 1985
PublishedOctober 2, 1985
GrantedJuly 25, 1990
Term endedMarch 25, 2005
Application numberEP 85103513
Classification (CPC)H04L5/1423 +1 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedMarch 25, 1985PublishedOct 2, 1985Patent grantedJuly 25, 1990Term endedMarch 25, 2005

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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