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Expired European patentEurope

Optical module for subcarrier multiplexed optical transmission system

EP 0673128 B1 · Applicant: NEC CORPORATION

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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 8, 1994 and granted October 24, 2001. A European patent lasts at most 20 years from filing, so its term ended March 8, 2014.
  • 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 8, 2019.
  • 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 8, 1994
PublishedSeptember 20, 1995
GrantedOctober 24, 2001
Term endedMarch 8, 2014
Application numberEP 94301630
Classification (CPC)H04B10/2507

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedMarch 8, 1994PublishedSep 20, 1995Patent grantedOct 24, 2001Term endedMarch 8, 2014

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.