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Expired European patentEurope

Improvement to digital packet switching networks

EP 0308565 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 September 23, 1987 and granted February 10, 1993. A European patent lasts at most 20 years from filing, so its term ended September 23, 2007.
  • 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 23, 2013.
  • 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.
FiledSeptember 23, 1987
PublishedMarch 29, 1989
GrantedFebruary 10, 1993
Term endedSeptember 23, 2007
Application numberEP 87480011
Classification (CPC)H04L12/64 +1 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedSep 23, 1987PublishedMarch 29, 1989Patent grantedFeb 10, 1993Term endedSep 23, 2007

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.