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Expired European patentEurope

Switching node for a communications switching network

EP 0494170 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 September 24, 1990 and granted October 13, 1993. A European patent lasts at most 20 years from filing, so its term ended September 24, 2010.
  • 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 March 24, 2016.
  • 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.
FiledSeptember 24, 1990
PublishedJuly 15, 1992
GrantedOctober 13, 1993
Term endedSeptember 24, 2010
Application numberEP 90913456
Classification (CPC)H04L12/6402 +2 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedSep 24, 1990PublishedJuly 15, 1992Patent grantedOct 13, 1993Term endedSep 24, 2010

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.