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Expired European patentEurope

Method and device for mixing or demixing optical beams for transmission on optical fibres

EP 0003575 B1 · Applicant: CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A.

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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 February 2, 1979 and granted May 5, 1982. A European patent lasts at most 20 years from filing, so its term ended February 2, 1999.
  • 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 August 2, 2004.
  • 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.
FiledFebruary 2, 1979
PublishedAugust 22, 1979
GrantedMay 5, 1982
Term endedFebruary 2, 1999
Application numberEP 79100314
Classification (CPC)G02B6/4246 +2 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedFeb 2, 1979PublishedAug 22, 1979Patent grantedMay 5, 1982Term endedFeb 2, 1999

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

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