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Expired European patentEurope

Method and system for error correction in digital transmission

EP 0442320 B1 · Applicant: Alcatel 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 January 29, 1991 and granted April 9, 1997. A European patent lasts at most 20 years from filing, so its term ended January 29, 2011.
  • 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 July 29, 2016.
  • 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.
FiledJanuary 29, 1991
PublishedAugust 21, 1991
GrantedApril 9, 1997
Term endedJanuary 29, 2011
Application numberEP 91101141
Classification (CPC)H03M13/151

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedJan 29, 1991PublishedAug 21, 1991Patent grantedApril 9, 1997Term endedJan 29, 2011

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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