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Expired European patentEurope

Carrier recovery method for modulation with a large number of phase/amplitude states

EP 0455089 B1 · Applicant: ALCATEL N.V.

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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, 1991 and granted March 4, 1998. A European patent lasts at most 20 years from filing, so its term ended April 22, 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 October 22, 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.
FiledApril 22, 1991
PublishedNovember 6, 1991
GrantedMarch 4, 1998
Term endedApril 22, 2011
Application numberEP 91106455
Classification (CPC)H04L27/3818

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedApril 22, 1991PublishedNov 6, 1991Patent grantedMarch 4, 1998Term endedApril 22, 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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