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Expired European patentEurope

Method of measuring a dc curent or a low-frequency ac current

EP 0128941 B1 · Applicant: TELEFONAKTIEBOLAGET L M ERICSSON

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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 December 14, 1983 and granted March 25, 1987. A European patent lasts at most 20 years from filing, so its term ended December 14, 2003.
  • 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 June 14, 2009.
  • 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.
FiledDecember 14, 1983
PublishedDecember 27, 1984
GrantedMarch 25, 1987
Term endedDecember 14, 2003
Application numberEP 84900314
Classification (CPC)G01R17/06

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedDec 14, 1983PublishedDec 27, 1984Patent grantedMarch 25, 1987Term endedDec 14, 2003

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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