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Expired European patentEurope

Wholly digital process for the generation of multi-level modulation signals

EP 0458385 B1 · Applicant: SIEMENS TELECOMUNICAZIONI 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 May 10, 1991 and granted July 23, 1997. A European patent lasts at most 20 years from filing, so its term ended May 10, 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 November 10, 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.
FiledMay 10, 1991
PublishedNovember 27, 1991
GrantedJuly 23, 1997
Term endedMay 10, 2011
Application numberEP 91201116
Classification (CPC)H04L27/365

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMay 10, 1991PublishedNov 27, 1991Patent grantedJuly 23, 1997Term endedMay 10, 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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