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Expired European patentEurope

Method and apparatus for handling ipv4 dns ptr queries across ipv4 and ipv6 networks

EP 1754351 B1 · Applicant: Cisco Technology, Inc.

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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 May 16, 2005 and granted March 27, 2019. A European patent lasts at most 20 years from filing, so its term ended May 16, 2025.
  • Supplementary protection certificates extend only medicine and crop-protection patents, and it isn't classified as either.
  • 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.
FiledMay 16, 2005
PublishedFebruary 21, 2007
GrantedMarch 27, 2019
Term endedMay 16, 2025
Application numberEP 05744186
Classification (CPC)H04L69/16 +2 more

Timeline

Timeline From EPO dates

2006200820102012201420162018202020222024Application filedMay 16, 2005PublishedFeb 21, 2007Patent grantedMarch 27, 2019Term endedMay 16, 2025

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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