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Expired European patentEurope

Security device for ring network

EP 0536348 B1 · Applicant: 3COM IRELAND

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 March 30, 1992 and granted May 8, 1996. A European patent lasts at most 20 years from filing, so its term ended March 30, 2012.
  • 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 September 30, 2017.
  • 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.
FiledMarch 30, 1992
PublishedApril 14, 1993
GrantedMay 8, 1996
Term endedMarch 30, 2012
Application numberEP 92907275
Classification (CPC)H04L63/00 +1 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedMarch 30, 1992PublishedApril 14, 1993Patent grantedMay 8, 1996Term endedMarch 30, 2012

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.