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Expired European patentEurope

Method and apparatus for generating a stream cipher

EP 1021887 B1 · Applicant: INTERDIGITAL TECHNOLOGY CORPORATION

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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 May 21, 1998 and granted July 21, 2004. A European patent lasts at most 20 years from filing, so its term ended May 21, 2018.
  • 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 November 21, 2023.
  • 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 21, 1998
PublishedJuly 26, 2000
GrantedJuly 21, 2004
Term endedMay 21, 2018
Application numberEP 98923584
Classification (CPC)H04L9/12 +2 more

Timeline

Timeline From EPO dates

1999200120032005200720092011201320152017Application filedMay 21, 1998PublishedJuly 26, 2000Patent grantedJuly 21, 2004Term endedMay 21, 2018

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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