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Expired European patentEurope

Encrypted communication method

EP 1705827 B1 · Applicant: NEC Corporation

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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 December 28, 2004 and granted August 20, 2014. A European patent lasts at most 20 years from filing, so its term ended December 28, 2024.
  • 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.
FiledDecember 28, 2004
PublishedSeptember 27, 2006
GrantedAugust 20, 2014
Term endedDecember 28, 2024
Application numberEP 04807948
Classification (CPC)H04L63/0428

Timeline

Timeline From EPO dates

2005200720092011201320152017201920212023Application filedDec 28, 2004PublishedSep 27, 2006Patent grantedAug 20, 2014Term endedDec 28, 2024

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.