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Expired European patentEurope

Graduated authentication in an identity management system

EP 1766840 B1 · Applicant: Callahan Cellular L.L.C.

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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 June 16, 2005 and granted July 13, 2016. A European patent lasts at most 20 years from filing, so its term ended June 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.
FiledJune 16, 2005
PublishedMarch 28, 2007
GrantedJuly 13, 2016
Term endedJune 16, 2025
Application numberEP 05757437
Classification (CPC)H04L63/08 +2 more

Timeline

Timeline From EPO dates

2006200820102012201420162018202020222024Application filedJune 16, 2005PublishedMarch 28, 2007Patent grantedJuly 13, 2016Term endedJune 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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