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Expired European patentEurope

High precision chromatic dispersion measuring method and automatic dispersion compensating optical system that uses this method

EP 1271814 B1 · Applicant: Nippon Telegraph and Telephone Corporation

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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 June 27, 2002 and granted January 15, 2014. A European patent lasts at most 20 years from filing, so its term ended June 27, 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.
FiledJune 27, 2002
PublishedJanuary 2, 2003
GrantedJanuary 15, 2014
Term endedJune 27, 2022
Application numberEP 02291604
Classification (CPC)H04B10/25133 +1 more

Timeline

Timeline From EPO dates

2003200520072009201120132015201720192021Application filedJune 27, 2002PublishedJan 2, 2003Patent grantedJan 15, 2014Term endedJune 27, 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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