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Expired European patentEurope

An optical switching system

EP 0527006 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 July 23, 1992 and granted June 7, 2000. A European patent lasts at most 20 years from filing, so its term ended July 23, 2012.
  • 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 January 23, 2018.
  • 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.
FiledJuly 23, 1992
PublishedFebruary 10, 1993
GrantedJune 7, 2000
Term endedJuly 23, 2012
Application numberEP 92306745
Classification (CPC)H04L7/0008 +1 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedJuly 23, 1992PublishedFeb 10, 1993Patent grantedJune 7, 2000Term endedJuly 23, 2012

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.