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Expired European patentEurope

Method and apparatus for the billing of value-added communication calls

EP 0452591 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 December 11, 1990 and granted June 12, 1996. A European patent lasts at most 20 years from filing, so its term ended December 11, 2010.
  • 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 June 11, 2016.
  • 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.
FiledDecember 11, 1990
PublishedOctober 23, 1991
GrantedJune 12, 1996
Term endedDecember 11, 2010
Application numberEP 90313462
Classification (CPC)H04M15/00 +2 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedDec 11, 1990PublishedOct 23, 1991Patent grantedJune 12, 1996Term endedDec 11, 2010

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.