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Expired European patentEurope

Method for securely using digital signatures in a commercial cryptographic system

EP 0771499 B1 · Applicant: CERTCO, LLC

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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 July 19, 1995 and granted September 28, 2005. A European patent lasts at most 20 years from filing, so its term ended July 19, 2015.
  • 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 January 19, 2021.
  • 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.
FiledJuly 19, 1995
PublishedMay 7, 1997
GrantedSeptember 28, 2005
Term endedJuly 19, 2015
Application numberEP 95934957
Classification (CPC)G06Q20/341 +2 more

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedJuly 19, 1995PublishedMay 7, 1997Patent grantedSep 28, 2005Term endedJuly 19, 2015

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.