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Expired European patentEurope

Gas insulated electric apparatus

EP 0476502 B1 · Applicant: HITACHI, LTD.

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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 September 11, 1991 and granted January 22, 1997. A European patent lasts at most 20 years from filing, so its term ended September 11, 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 March 11, 2017.
  • 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.
FiledSeptember 11, 1991
PublishedMarch 25, 1992
GrantedJanuary 22, 1997
Term endedSeptember 11, 2011
Application numberEP 91115373
Classification (CPC)H02B13/065

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedSep 11, 1991PublishedMarch 25, 1992Patent grantedJan 22, 1997Term endedSep 11, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.