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Expired European patentEurope

An improved technique for voice-based security systems

EP 0533396 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 September 10, 1992 and granted November 27, 1996. A European patent lasts at most 20 years from filing, so its term ended September 10, 2012.
  • 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 March 10, 2018.
  • 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.
FiledSeptember 10, 1992
PublishedMarch 24, 1993
GrantedNovember 27, 1996
Term endedSeptember 10, 2012
Application numberEP 92308221
Classification (CPC)G10L17/22 +1 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedSep 10, 1992PublishedMarch 24, 1993Patent grantedNov 27, 1996Term endedSep 10, 2012

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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