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Identification control apparatus, method for cryptographic identity control and method for detecting an interruption between a terminal and a communication system

EP 0304547 A2 · Applicant: SIEMENS AKTIENGESELLSCHAFT

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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 April 22, 1982 and never granted as a European patent. Had it been granted, its 20-year term would have ended April 22, 2002.
  • 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 October 22, 2007.
  • 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.
FiledApril 22, 1982
PublishedMarch 1, 1989
GrantedNever granted
Term endedApril 22, 2002
Application numberEP 88107516
Classification (CPC)H04L9/32 +1 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedApril 22, 1982PublishedMarch 1, 1989Term endedApril 22, 2002

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.