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Expired European patentEurope

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EP 0531047 B1 · Applicant: AT&T Corp.

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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 August 27, 1992 and granted November 18, 1998. A European patent lasts at most 20 years from filing, so its term ended August 27, 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 February 27, 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.
FiledAugust 27, 1992
PublishedMarch 10, 1993
GrantedNovember 18, 1998
Term endedAugust 27, 2012
Application numberEP 92307803
Classification (CPC)H04B10/07 +2 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedAug 27, 1992PublishedMarch 10, 1993Patent grantedNov 18, 1998Term endedAug 27, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.