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Expired European patentEurope

Mode-field transforming optical waveguide and corresponding method of manufacture

EP 0665451 B1 · Applicant: AT&T Corp.

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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 December 9, 1994 and granted August 2, 2000. A European patent lasts at most 20 years from filing, so its term ended December 9, 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 June 9, 2020.
  • 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.
FiledDecember 9, 1994
PublishedAugust 2, 1995
GrantedAugust 2, 2000
Term endedDecember 9, 2014
Application numberEP 94309186
Classification (CPC)G02B6/02052 +1 more

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedDec 9, 1994PublishedAug 2, 1995Patent grantedAug 2, 2000Term endedDec 9, 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.