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Expired European patentEurope

Method of sharing and transferring information between isdn telephones

EP 1023800 B1 · Applicant: AMERITECH CORPORATION

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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 October 13, 1998 and granted April 14, 2010. A European patent lasts at most 20 years from filing, so its term ended October 13, 2018.
  • 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 April 13, 2024.
  • 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.
FiledOctober 13, 1998
PublishedAugust 2, 2000
GrantedApril 14, 2010
Term endedOctober 13, 2018
Application numberEP 98952264
Classification (CPC)H04M1/253 +2 more

Timeline

Timeline From EPO dates

1999200120032005200720092011201320152017Application filedOct 13, 1998PublishedAug 2, 2000Patent grantedApril 14, 2010Term endedOct 13, 2018

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.