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Expired European patentEurope

A method for measuring the overall loss in four-wire phone circuits, and apparatus for carrying it out

EP 0253062 B1 · Applicant: RAI RADIOTELEVISIONE ITALIANA

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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 March 24, 1987 and granted May 27, 1992. A European patent lasts at most 20 years from filing, so its term ended March 24, 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 September 24, 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.
FiledMarch 24, 1987
PublishedJanuary 20, 1988
GrantedMay 27, 1992
Term endedMarch 24, 2007
Application numberEP 87104272
Classification (CPC)H04B3/48

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedMarch 24, 1987PublishedJan 20, 1988Patent grantedMay 27, 1992Term endedMarch 24, 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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