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Expired European patentEurope

Method for obtaining a phase difference signal

EP 0249045 B1 · Applicant: ANT Nachrichtentechnik GmbH

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Overview

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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 14, 1987 and granted November 28, 1990. A European patent lasts at most 20 years from filing, so its term ended May 14, 2007.
  • 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 14, 2012.
  • 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 14, 1987
PublishedDecember 16, 1987
GrantedNovember 28, 1990
Term endedMay 14, 2007
Application numberEP 87106986
Classification (CPC)H04L27/38

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedMay 14, 1987PublishedDec 16, 1987Patent grantedNov 28, 1990Term endedMay 14, 2007

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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