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Expired European patentEurope

Method of error recovery in a data communication system

EP 0513232 B1 · Applicant: INTERNATIONAL BUSINESS MACHINES 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 February 19, 1991 and granted July 3, 1996. A European patent lasts at most 20 years from filing, so its term ended February 19, 2011.
  • 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 August 19, 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.
FiledFebruary 19, 1991
PublishedNovember 19, 1992
GrantedJuly 3, 1996
Term endedFebruary 19, 2011
Application numberEP 91905033
Classification (CPC)H04L1/16 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedFeb 19, 1991PublishedNov 19, 1992Patent grantedJuly 3, 1996Term endedFeb 19, 2011

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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