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Expired European patentEurope

Digital conference circuit and method

EP 0067006 B1 · Applicant: NORTHERN TELECOM LIMITED

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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 May 25, 1982 and granted January 22, 1986. A European patent lasts at most 20 years from filing, so its term ended May 25, 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 November 25, 2007.
  • 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.
FiledMay 25, 1982
PublishedDecember 15, 1982
GrantedJanuary 22, 1986
Term endedMay 25, 2002
Application numberEP 82302674
Classification (CPC)H04M3/569

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedMay 25, 1982PublishedDec 15, 1982Patent grantedJan 22, 1986Term endedMay 25, 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.