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Expired European patentEurope

Method and apparatus for providing call tracing service

EP 0150183 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 August 29, 1983 and granted November 11, 1987. A European patent lasts at most 20 years from filing, so its term ended August 29, 2003.
  • 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 1, 2009.
  • 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 29, 1983
PublishedAugust 7, 1985
GrantedNovember 11, 1987
Term endedAugust 29, 2003
Application numberEP 83903626
Classification (CPC)H04Q3/72

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedAug 29, 1983PublishedAug 7, 1985Patent grantedNov 11, 1987Term endedAug 29, 2003

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.