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Expired European patentEurope

Homopolar transformer for differential switches or circuit breakers, and mounting method

EP 0456583 B1 · Applicant: MERLIN GERIN

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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 April 19, 1991 and granted June 22, 1994. A European patent lasts at most 20 years from filing, so its term ended April 19, 2011.
  • 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 October 19, 2016.
  • 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.
FiledApril 19, 1991
PublishedNovember 13, 1991
GrantedJune 22, 1994
Term endedApril 19, 2011
Application numberEP 91420129
Classification (CPC)H01H83/144 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedApril 19, 1991PublishedNov 13, 1991Patent grantedJune 22, 1994Term endedApril 19, 2011

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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