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Expired European patentEurope

Telemetry for optical fiber amplifier repeater

EP 0449475 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 March 18, 1991 and granted September 10, 1997. A European patent lasts at most 20 years from filing, so its term ended March 18, 2011.
  • 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 September 18, 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.
FiledMarch 18, 1991
PublishedOctober 2, 1991
GrantedSeptember 10, 1997
Term endedMarch 18, 2011
Application numberEP 91302307
Classification (CPC)H04B10/2912 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMarch 18, 1991PublishedOct 2, 1991Patent grantedSep 10, 1997Term endedMarch 18, 2011

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.