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Expired European patentEurope

Method and apparatus for reconfiguring interconnections between switching system functional units

EP 0451400 B1 · Applicant: AT&T Corp.

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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 October 12, 1990 and granted March 27, 1996. A European patent lasts at most 20 years from filing, so its term ended October 12, 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 April 12, 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.
FiledOctober 12, 1990
PublishedOctober 16, 1991
GrantedMarch 27, 1996
Term endedOctober 12, 2010
Application numberEP 90311203
Classification (CPC)H04Q11/0407 +1 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedOct 12, 1990PublishedOct 16, 1991Patent grantedMarch 27, 1996Term endedOct 12, 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

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