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Expired European patentEurope

Secret-key-controlled reversible circuit and corresponding method of data processing

EP 1661295 B1 · Applicant: Telecom Italia S.p.A.

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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 September 5, 2003 and granted March 27, 2013. A European patent lasts at most 20 years from filing, so its term ended September 5, 2023.
  • 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.
FiledSeptember 5, 2003
PublishedMay 31, 2006
GrantedMarch 27, 2013
Term endedSeptember 5, 2023
Application numberEP 03758653
Classification (CPC)H04L9/0618

Timeline

Timeline From EPO dates

2004200620082010201220142016201820202022Application filedSep 5, 2003PublishedMay 31, 2006Patent grantedMarch 27, 2013Term endedSep 5, 2023

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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