Patent Yard Sign in
Expired European patentEurope

Method and device for detecting the presence of one or more MFC-frequencies within a PCM-signal

EP 0010783 B1 · Applicant: Staat der Nederlanden (Staatsbedrijf der Posterijen, Telegrafie en Telefonie)

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed August 29, 1979 and granted November 4, 1981. A European patent lasts at most 20 years from filing, so its term ended August 29, 1999.
  • 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 1, 2005.
  • 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.
FiledAugust 29, 1979
PublishedMay 14, 1980
GrantedNovember 4, 1981
Term endedAugust 29, 1999
Application numberEP 79200473
Classification (CPC)H04Q1/4575

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedAug 29, 1979PublishedMay 14, 1980Patent grantedNov 4, 1981Term endedAug 29, 1999

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.