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Expired European patentEurope

A monitoring device for overhead power transmission system

EP 0247544 B1 · Applicant: SUMITOMO ELECTRIC INDUSTRIES LIMITED

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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 22, 1987 and granted September 11, 1991. A European patent lasts at most 20 years from filing, so its term ended May 22, 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 22, 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 22, 1987
PublishedDecember 2, 1987
GrantedSeptember 11, 1991
Term endedMay 22, 2007
Application numberEP 87107511
Classification (CPC)G01R15/18 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedMay 22, 1987PublishedDec 2, 1987Patent grantedSep 11, 1991Term endedMay 22, 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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