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Expired European patentEurope

PSK demodulator with freqency multiplication for the correction of phase and frequency errors

EP 0533191 B1 · Applicant: NEC CORPORATION

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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 18, 1992 and granted March 2, 2005. A European patent lasts at most 20 years from filing, so its term ended September 18, 2012.
  • 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 March 18, 2018.
  • 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 18, 1992
PublishedMarch 24, 1993
GrantedMarch 2, 2005
Term endedSeptember 18, 2012
Application numberEP 92116016
Classification (CPC)H04L27/2332

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedSep 18, 1992PublishedMarch 24, 1993Patent grantedMarch 2, 2005Term endedSep 18, 2012

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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