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EP 0331402 B1 · Applicant: BRITISH TELECOMMUNICATIONS public limited company

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 27, 1989 and granted December 16, 1992. A European patent lasts at most 20 years from filing, so its term ended February 27, 2009.
  • 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 27, 2014.
  • 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 27, 1989
PublishedSeptember 6, 1989
GrantedDecember 16, 1992
Term endedFebruary 27, 2009
Application numberEP 89301939
Classification (CPC)G02B6/4454 +1 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedFeb 27, 1989PublishedSep 6, 1989Patent grantedDec 16, 1992Term endedFeb 27, 2009

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.