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Expired European patentEurope

Encryption device and apparatus for encryption/decryption based on the Montgomery method using efficient modular multiplication

EP 0656709 B1 · Applicant: CANON KABUSHIKI KAISHA

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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 November 29, 1994 and granted July 13, 2005. A European patent lasts at most 20 years from filing, so its term ended November 29, 2014.
  • 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 May 29, 2020.
  • 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.
FiledNovember 29, 1994
PublishedJune 7, 1995
GrantedJuly 13, 2005
Term endedNovember 29, 2014
Application numberEP 94308810
Classification (CPC)H04L9/3006 +2 more

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedNov 29, 1994PublishedJune 7, 1995Patent grantedJuly 13, 2005Term endedNov 29, 2014

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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