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Expired European patentEurope

Optical multiplexer/demultiplexer

EP 0123237 B1 · Applicant: Licentia Patent-Verwaltungs-GmbH

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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 April 14, 1984 and granted August 6, 1986. A European patent lasts at most 20 years from filing, so its term ended April 14, 2004.
  • 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 October 14, 2009.
  • 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.
FiledApril 14, 1984
PublishedOctober 31, 1984
GrantedAugust 6, 1986
Term endedApril 14, 2004
Application numberEP 84104247
Classification (CPC)G02B6/2938 +2 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedApril 14, 1984PublishedOct 31, 1984Patent grantedAug 6, 1986Term endedApril 14, 2004

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.