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European application, no grantEurope

Operating circuit for an inverter and process for operating a power electronic switch

EP 0457097 A2 · Applicant: Zumtobel Aktiengesellschaft

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 30, 1991 and never granted as a European patent. Had it been granted, its 20-year term would have ended April 30, 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 30, 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 30, 1991
PublishedNovember 21, 1991
GrantedNever granted
Term endedApril 30, 2011
Application numberEP 91107003
Classification (CPC)H05B41/2828

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedApril 30, 1991PublishedNov 21, 1991Term endedApril 30, 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.