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Expired European patentEurope

Method of controlling optical signal power at an add/drop node in a WDM optical communication system

EP 1278326 B1 · Applicant: LUCENT TECHNOLOGIES INC.

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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 22, 2002 and granted October 15, 2003. A European patent lasts at most 20 years from filing, so its term ended May 22, 2022.
  • Supplementary protection certificates extend only medicine and crop-protection patents, and it isn't classified as either.
  • 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 22, 2002
PublishedJanuary 22, 2003
GrantedOctober 15, 2003
Term endedMay 22, 2022
Application numberEP 02253582
Classification (CPC)H04J14/02216 +2 more

Timeline

Timeline From EPO dates

2003200520072009201120132015201720192021Application filedMay 22, 2002PublishedJan 22, 2003Patent grantedOct 15, 2003Term endedMay 22, 2022

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

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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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