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Expired European patentEurope

Method to assure the confidentiality of an audiolink and local telecommunication network carrying out this method

EP 0690604 B1 · Applicant: THOMSON-CSF

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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 June 20, 1995 and granted July 21, 1999. A European patent lasts at most 20 years from filing, so its term ended June 20, 2015.
  • 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 December 20, 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.
FiledJune 20, 1995
PublishedJanuary 3, 1996
GrantedJuly 21, 1999
Term endedJune 20, 2015
Application numberEP 95401456
Classification (CPC)H04Q11/0428 +1 more

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedJune 20, 1995PublishedJan 3, 1996Patent grantedJuly 21, 1999Term endedJune 20, 2015

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.