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Expired European patentEurope

Adaptive differential PCM system with residual-driven adaptation of feedback predictor

EP 0131817 B1 · Applicant: NORTHERN TELECOM LIMITED

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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 June 29, 1984 and granted May 31, 1989. A European patent lasts at most 20 years from filing, so its term ended June 29, 2004.
  • 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 December 29, 2009.
  • 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.
FiledJune 29, 1984
PublishedJanuary 23, 1985
GrantedMay 31, 1989
Term endedJune 29, 2004
Application numberEP 84107530
Classification (CPC)H03M3/042

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedJune 29, 1984PublishedJan 23, 1985Patent grantedMay 31, 1989Term endedJune 29, 2004

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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